Is there any real technical reason that forbid a non Android underdog phone maker like Pine64 to be able to run banking apps as MFA devices? I mean, I don't see

Is there any real technical reason that forbid a non Android underdog phone maker like Pine64 to be able to run banking apps as MFA devices? I mean, I don't see any tech issue for this phone to provide a secure enclave chip (I mean, like one in a yubikey) and enroll in a standard WebAuthn workflow. I'm specifically looking at UE banks regulations that forces me to use my Android phone to permit/deny any operation instead of letting me use if I want my yubikey to do the same in the browser