Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
I have a similar issue.
Had my small business MS365 account authenticator on my phone, but lost the phone on vacation. Unable to get into admin portal to disable MFA because I don't have the authenticator app setup, and unlike google authenticator MS decided not to offer a way to back the authenticator data up...
Tried to call MS Support and although I haven't changed phone number, I never paired a phone number with my account, and hence MS wont accept a call from an unregistered phone number.
So I'm stuck. Unable to talk to MS Support, unable to login, unable to do anything. FFS.
Microsoft testers should be fired, as this scenario cant be that rare, but its not catered for.
M