Where to check a Microsoft 365 service problem

This sheet compares Correct resource, Wrong pick to avoid.

CriterionCorrect resourceWrong pick to avoid
Admins locked out of the admin centre entirely, suspect a sign-in outageThe public service status page (works without sign-in)Service health dashboard, Message center feed or organization profile (all live inside the admin centre, unreachable while locked out); the Azure Service Health blade also misses it, but because it covers Azure resources, not Microsoft 365 sign-in

The verdict, the full comparison, 4 rules and 3 traps are part of AB-650 access. Unlock AB-650.