An integrated threat protection solution designed to detect, investigate, and respond to cyber threats across Microsoft 365 services.
Hello xander hodges,
I’m sorry to hear that. That said, this forum is a community place, so we can’t open a compromised-account case for you. Microsoft’s guidance for a username that is no longer recognized includes a Contact support option here: My username and password have stopped working. Tell the support advocate that the account was taken over, the sign-in address and security methods were changed, and the recovery form will not accept the former address. If you need another account to reach support, the existing reply’s suggestion may help with that step.