Blocked User in MFA Cause Not Able to Receive MFA Request and Not Able to Log into Azure

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

1  https://security.microsoft.com/restrictedusers

2 https://portal.azure.com/#blade/Microsoft_AAD_IAM/SecurityMenuBlade/RiskyUsers

3 https://aad.portal.azure.com/#blade/Microsoft_AAD_IAM/MultifactorAuthenticationMenuBlade/BlockedUsers/fromProviders/

https://portal.azure.com/#view/Microsoft_AAD_IAM/MultifactorAuthenticationMenuBlade/~/BlockedUsers/

4 Unblock User

References