EWS update: the allow-list is now required from Oct 10, not Oct 1 (MC1485116)
Microsoft only builds a list for tenants that had EwsEnabled set to $true on Oct 2. If you set it to $true now without a list, you're on your own
What changed, and a script to check the list
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EWSAllowedAppIDs Required from October 10 – What Changed and What to Do Now
October 1 was the date we all prepared for. But in true Microsoft fashion, the wording kept shifting, from turning off EWS on October 1, to EwsEnabled changing "on (or soon after)" October 1, to