A Microsoft app for iOS and Android devices that enables authentication with two-factor verification, phone sign-in, and code generation
I am getting the same thing through my Microsoft Authenticator app on my Android based Samsung phone.
I get a dozen at least of these notifications. Because there is not real attempt happening I do not have the number that the app wants me to select from. So I just hit deny or ignore it.
Also, I have already changed the password to a "hard" password random string of characters. Twice.
So I know that this is not a case of the account being hijacked.
Also, I checked the sign in activity. Nothing unusual. Just my standard hardware.
What I can't find is a list of apps or activities that have called for authentication. That would tell me immediately what the conflicting app was.