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
Accept as answer if the reply is helpful--
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.