A Microsoft app for iOS and Android devices that enables authentication with two-factor verification, phone sign-in, and code generation
I think that once the phone’s wiped and you don’t know which acct held the auth‑backup, the restore flow won’t surface it at all… I’d use https://aka.ms/forgotusername to pin down the exact MSA, then sign into Authenticator with that one — only that acct can pull the Feb backup back.