The issue:

I had a customer who called about a single user had issues with setting MFA up to use text, Phone call or even Microsoft Authenticator via. http://aka.ms/MFASetup. The call or text message was never received. In the Authenticator App, when they scanned the QR code, they got the following error pop up:

“Activation failed. Make sure that push notifications are enabled on the phone and your Activation Code is not wrong, expired or formerly used.”

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