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Merill Fernando 💚

@merill.net
6.2K followers 4.4K following 3.8K posts

Product Manager @microsoft | Creator of bluesky.ms • cmd.ms • idPowerToys.merill.net • Graph X-Ray • 🇦🇺 • 🇱🇰 • Posts my own youtube.com/@merillx Sign up to my newsletter entra.news

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Merill Fernando 💚 @merill.net · 03/10/2026
Squeezing out the last bits of my Fable quota for Maester 3.0 research, planning and design. 🔥 Maester 3.0 is going to be huge when it comes out next quarter.
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Merill Fernando 💚 @merill.net · 28/09/2026
Self-hosted Maester Cloud is ready 🔥 You can now buy it and deploy it into your own Azure subscription with guided setup. → Scheduled Maester runs with the built-in runner → Drift tracking, test by test → Email reports and drift alerts from your own mailbox
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Merill Fernando 💚 @merill.net · 28/09/2026
This week's entra.news is out!
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Merill Fernando 💚 @merill.net · 25/09/2026
Folks, phishers have figured out rage bait. Got this today from "SendGrid HR". They're adding a trans youth message to my email footer this month. Don't want it? Just click the button to remove it. Sender is noreply@billkill.no Rage is the new urgency.
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Merill Fernando 💚 @merill.net · 23/09/2026
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Merill Fernando 💚 @merill.net · 17/09/2026
Developers wouldn't ship without tests. Identity teams ship changes to a 30-year-old directory every single day with nothing but a change ticket and hope. 269 checks. Read-only. Runs from your workstation. There's no good reason not to have a baseline for AD 🎙️ entra.chat
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Merill Fernando 💚 @merill.net · 15/09/2026
Entra News #166 is out!
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Merill Fernando 💚 @merill.net · 06/09/2026
Issue #165 of Entra News is out and its a bumper issue. Get it at entra.news/p/entra-n...
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Merill Fernando 💚 @merill.net · 01/09/2026
We just sent out this week's Microsoft AI news roundup. Get it at msai.ms Subscribe today!
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Merill Fernando 💚 @merill.net · 31/08/2026
General Motors is ~200,000 people into its passkey rollout. Andrew Cameron on Windows Hello at scale, factory floors, and the guest accounts that make it hard. Watch / Listen to the full episode on Entra Chat. entra.news/p/how-gen...
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Merill Fernando 💚 @merill.net · 30/08/2026
We just sent out this week's Entra newsletter - Issue #164 Get it at entra.news
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Merill Fernando 💚 @merill.net · 28/08/2026
👋 Folks after year long hiatus the community powered database of aka•ms is back!! Bookmark it 👇 akams.fyi PS. I made some updates to the site, including a much simpler experience to contribute aka•ms links to the database.
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Merill Fernando 💚 @merill.net · 28/08/2026
👋 Folks, I’ll be joining Sam and Mike to show how you can go beyond security baselines and build custom security tests with Maester across Entra ID, on-prem AD, and your entire hybrid estate. 📅 September 10 at 11:00 AM Hope to see you there!
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Merill Fernando 💚 @merill.net · 27/08/2026
👋 PSA - M365 admins: quick heads up myaccount.microsoft.com 👇 myaccount.cloud.micr...
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Merill Fernando 💚 @merill.net · 27/08/2026
"If it ain't broke, don't fix it" is why AD groups still run licensing in a lot of Entra tenants. On 3 November, part of that setup stops working. The clip explains the habit. The episode covers the fix. Gregor Reimling, René Wasel + Eric Woodruff. 🎧 entra.chat
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Merill Fernando 💚 @merill.net · 26/08/2026
Folks, I just re-started MSAI weekly, your weekly round up of the Microsoft AI updates worth knowing. Including Microsoft 365 Copilot, GitHub Copilot, Azure AI Foundry, Copilot Studio, Security Copilot, Microsoft Fabric, Agent 365, and more. Check it out at msai.ms and subscribe today.
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Merill Fernando 💚 @merill.net · 22/08/2026
I just sent out issue #163 of the weekly Entra News. Get it today and subscribe if you haven't already! entra.news
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Merill Fernando 💚 @merill.net · 21/08/2026
Today I accidentally wandered into the wrong neighbourhood on X. PS. I’m loving it 😂
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Merill Fernando 💚 @merill.net · 18/08/2026
Folks, I'm excited to announce something for all the die hard Intune fans. Check out daily.intune.admin.news today! + bookmark it. BONUS: Sign up for the email newsletter to get the updates delivered straight to you inbox daily.
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Merill Fernando 💚 @merill.net · 17/08/2026
He copied a value out of the Windows Event Log. Pasted it into his special browser. And he was signed into Microsoft Entra as the user who had just authenticated. No password. No phishing link. No stolen private key. @MGrafnetter's Black Hat USA 2026 research Watch at entra.chat
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Merill Fernando 💚 @merill.net · 15/08/2026
Have you read this weeks Entra.News ?
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Merill Fernando 💚 @merill.net · 14/08/2026
Did you know your Entra dynamic groups could be granting AI agents access to apps and services without you realizing it? You might even be assigning them licenses and running out of licenses for your human users. Find out how to fix at merill.net/blog
An agent's user account is a subtype of user identity within Microsoft Entra. An agent's user account is evaluated by user-based membership rules and can be included in a dynamic user group when it satisfies the rule.

By default, an agent's user account isn't distinguished from other user identities. To exclude these accounts, include a condition in the membership rule. You can also create rules that include only agents' user accounts or target accounts associated with a specific agent identity blueprint. Agent identities, which are service principals, aren't supported as members of dynamic membership groups.
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Merill Fernando 💚 @merill.net · 11/08/2026
Now I can find and fix vulnerabilities in my own code. I'm glad to see OpenAI making these model's available to help make our app's secure. FYI For those who want to get access to Daybreak Blue 👇 openai.com/index/exp...
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Merill Fernando 💚 @merill.net · 11/08/2026
Microsoft-managed SMS and voice MFA retires in 2027. In Episode 70 of Entra.Chat, Jai Maharaj shares a practical path from SMS to passkeys covering profiles, rollout, Conditional Access, secure onboarding and account recovery. Watch or listen: entra.chat
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Merill Fernando 💚 @merill.net · 09/08/2026
A busy week in Microsoft Entra 👀 The announcements are one thing. Understanding what they actually mean for admins is another. This week, the Entra community has been digging into the memberOf retirement, passkey changes, managed policy updates & more Lots of practical guidance and analysis 👇
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Merill Fernando 💚 @merill.net · 06/08/2026
I start each day with a concise “Day in brief.” It gives you one clear headline, a plain English overview and the key Microsoft Entra changes worth knowing. Perfect for answering: “What changed today?”
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Merill Fernando 💚 @merill.net · 06/08/2026
Love the weekly Entra.News? Meet its over-caffeinated sibling → Daily.Entra.News 👀💥🙀 Today I’m launching a new resource for truly hardcore Entra fans A faster way to see what changed on Microsoft Entra
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Merill Fernando 💚 @merill.net · 03/08/2026
🚨 Entra Conditional Access gotcha from Andres Canello Selecting every device platform ≠ “Any device.” An attacker can spoof the browser user-agent, get no platform match, and that CA policy condition won’t apply. Watch Entra.Chat with for more nuggets 👇 entra.news/p/the-ult...
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Merill Fernando 💚 @merill.net · 02/08/2026
Issue #160 of Entra.News is out! Get it at entra.news/p/entra-n...
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Merill Fernando 💚 @merill.net · 29/07/2026
Insider Risk Is a Business Decision - Bring HR In Early
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Merill Fernando 💚 @merill.net · 28/07/2026
I’ll be honest. Purview has always felt like someone else’s part of the Microsoft security stack. I’m an Entra person. Ray Reyes isn’t, and that’s why I wanted him on Entra.Chat The lines between our products and teams are disappearing.
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Merill Fernando 💚 @merill.net · 28/07/2026
Folks, Maester 2.2 is here!! It was just a couple of months ago when we launched Maester 2.0 and the amazing Maester community has been SUPER busy.
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Merill Fernando 💚 @merill.net · 26/07/2026
We just sent out the latest Entra News for the week. Check it out! entra.news/p/entra-n...
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Merill Fernando 💚 @merill.net · 25/07/2026
Putting the final touches on the upcoming 🔥 Maester 2.2 release and look at this! A new Contributors page dedicated to the awesome community of folks that make Maester what it is today. Check it out and click through to the detail page of each author. maester.dev/contribu...
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Merill Fernando 💚 @merill.net · 20/07/2026
I was explaining how Microsoft Entra Staged Rollout works and realised it would make a great video especially the under-the-hood details that aren’t in the docs. A quick 7-minute walkthrough is coming soon. What would you like me to cover? 👇
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Merill Fernando 💚 @merill.net · 19/07/2026
Huge Entra News this week. Microsoft announced plans to phase out SMS and Voice from Entra and passkeys becoming the default. 1/3
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Merill Fernando 💚 @merill.net · 13/07/2026
We just added GitHub to the list of products that Maester monitors the security configuration for. These are CIS tests too!
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Merill Fernando 💚 @merill.net · 13/07/2026
Here's a snapshot of the custom Maester tests that I got Sol to write for me as it helps me configure the new Entra External ID tenant. It monitors ✅ Sign-up/sign-in user flows ✅ Email OTP + passkey policies ✅ Conditional Access for the portal ✅ Service principal credentials & permissions 2/3
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Merill Fernando 💚 @merill.net · 13/07/2026
The best time to set up security tests for your Entra tenant is when you create it The next best time is today 😉 I'm spinning up Entra External ID tenants for maester.cloud (my SaaS solution), & every one gets Maester baked in from day one 🔥 Maester monitoring Maester Cloud. As it should be 1/3
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Merill Fernando 💚 @merill.net · 12/07/2026
One compromised Agent ID blueprint can become a multitenant blast radius. That is the most important idea in my latest conversation with Katie Knowles, Senior Security Researcher at Datadog, about her three-part security analysis of Microsoft Entra Agent ID. Watch or listen: entra.chat
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Merill Fernando 💚 @merill.net · 10/07/2026
Me teaching Entra Workload ID Federation to Sol. Fable made the same mistake too. All those badly coded auth code is tripping up the LLMs. For reference this is the article I linked to devblogs.microsoft.c...
wouldn't this be the way to do it withtout certs? https://devblogs.microsoft.com/identity/access-cloud-resources-across-tenants-without-secrets/

13:23

Worked for 1m 2s

Yes. You found the missing piece, and my earlier conclusion was too restrictive.
The app registration and managed identity stay together in the Azure workforce tenant. The app is made multitenant, then its service principal is provisioned into each External ID tenant and attached to the user flow.
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Merill Fernando 💚 @merill.net · 05/07/2026
👋 We just sent out this week's Entra newsletter. Check it out at entra.news/p/entra-n...
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Merill Fernando 💚 @merill.net · 04/07/2026
Thomas's point: attackers do not need sci-fi autonomous hacking to win. If your agent blindly installs a package, connects to an untrusted MCP server, or follows a malicious skill, the boring path works first. 2/8
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Merill Fernando 💚 @merill.net · 04/07/2026
AI agent risk is not just attackers using AI. It is attackers targeting the agent ecosystem most orgs cannot see yet: MCP servers, skills, packages, API keys, tool calls, and prompts. I talked with Thomas Roccia about the new blind spot: 1/8
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Merill Fernando 💚 @merill.net · 28/06/2026
👋 Folks "passkeys won't save you." Vince Smith, who leads Agent ID at Microsoft Entra, explains why: squeeze one end of the balloon (users) and attackers move to the other 👉 NHI + workloads. New Entra Chat 👇 entra.news/p/from-wi...
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Merill Fernando 💚 @merill.net · 25/06/2026
Tiny AI workflow hack that saves me every day Pin your top 3 active chats and give each one an emoji. Now you can switch contexts instantly without hunting through old threads. Works with ChatGPT, Codex, Claude, Cursor, GitHub CP or any tool where projects pile up. Simple, but underrated.
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Merill Fernando 💚 @merill.net · 20/06/2026
Not every admin in your tenant is a person. 👀 Erica Zelic and I break down the "shadow admins" apps, service principals & agent identities quietly holding the keys to your Entra tenant. New Entra Chat episode: entra.news/p/shadow-...
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Merill Fernando 💚 @merill.net · 15/06/2026
AI agents should not get a blank check to your tenant. I added experimental Guardrails to Lokka.dev so you can limit model-driven Microsoft Graph/Azure calls by HTTP method, API path, tenant, or specific resources. ➕ When something is blocked, Lokka shows exactly why and where to fix it.
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Merill Fernando 💚 @merill.net · 14/06/2026
This week's Entra News is out. Get it at entra.news
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Merill Fernando 💚 @merill.net · 13/06/2026
3 things from chat w/ Nikhil→ 10+yrs in Microsoft identity, there for the birth of Conditional Access → The only recommended CA control for agents today is block & that's good for your users → Compromise now shows up first from agents, not humans → LLMs confidently recommend insecure defaults 2/3
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