If you are the only global admin on the account and are blocked entirely, you can reach out to the Data Protection team to restore access. 866-807-5850
--please don't forget to upvote
and Accept as answer
if the reply is helpful--
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Currently stuck in a login loop with authenticator. I am logged and I have access to our main Microsoft login. The problem lays in 365 creating a new domain name for us. We need this login for setting up work computers. The new domain has somehow become registered with Authenticator. Turning off 2 step verification and removing the app sign in for the orginal domain name does not affect the new domain name. The new name is a ".onmicrosoft.com" if that is somehow an issue here. I cannot add anymore computers to our work profile without being able to access this login and I cannot login without verifying on Authenticator but I cannot verify it because I havent added it to the Authenticator which I cannot do without verifying it thropugh the Authenticator. It is a tremendously irritating loop. I have deleted everything and redownloaded it as well as turned 2 factor authentication off and back on.
If you are the only global admin on the account and are blocked entirely, you can reach out to the Data Protection team to restore access. 866-807-5850
--please don't forget to upvote
and Accept as answer
if the reply is helpful--