If you are the only global admin on the account and are blocked entirely, you can reach out to the 365 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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I need help to login to my work Microsoft Account, i just lost my phone with the Authenticator app, unfortunately, i had not set up alternative login yet. I am the administrator for my organisation what can i do to remove the login from the lost phone to be able to login using a new one.
If you are the only global admin on the account and are blocked entirely, you can reach out to the 365 Data Protection team to restore access. 866-807-5850
--please don't forget to upvote
and Accept as answer
if the reply is helpful--