A single user couldn’t log in via Multi-Factor Authentication. SMS code would say it was sent, wouldn’t come through. Phone call also wouldn’t come through. Trying to set up another MFA method aka.ms/mfasetup would receive one of these errors:
You are blocked from performing this operation. Please contact your administrator for help.
We’re sorry, we ran into a problem. Please select “Next to try again.
Symptoms
Troubleshooting Steps
There’s several areas you can check for blocked users such as: