Steps for resetting an EXISTING user to M365. 

1. Require MFA  re-registration so authenticator is active on the users device
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2. Once the user is successfully signed in, he or she can access Microsoft Authenticator  > 3 dots top right (Android) 3 lines top left (iOS) > Settings
3. In the settings select device registration
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   2. CREATE THE TAP FOR THE USER AT THIS STEP
   3. You can follow the steps here: https://forsynse.com/kb/create-temporary-access-pass/
4. In this screen, you’ll see a + symbol at the top and it will allow you to complete the device registration here.  It I’ll either ask the user to sign in and MFA or ask for the TAP depending on the most recent MFA token.
6. Once this process goes through, the user should be able to access Outlook / Teams. It may take a minute for the registration to confirm with M365 but this is all we need to do.