Issue with setting up Azure MFA in Microsoft Authenticator. Activation failed.

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. 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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