EDIT: You know, after some time to cool off, Google Authenticator 2FA can still be enabled and isn’t being phased out like the less secure SMS 2FA, so it’s really not the end of the world here. The chance of permanent lockout is avoided, even if the whole Google Prompt system is still wack.
What device does it say it's sending the request to?
A device. The fact that any device is getting a google prompt and it cannot be disabled is the issue.
Right. I think you can see where I'm going with this. The fact that you're being dodgy with the question is making me question your motives with this post.
So, what device? You don't have to tell me the name, but describe it to me. Is it the device that you flashed a new OS onto?
It's not constructive to answer your question instead of explain the situation to you for the 8th time. There is only one device and it was wiped and can never be recovered, not even by restoring the OS, but the Google Prompt is still the default option forever now. I found this mildly infuriating.
The best solution is to use something like Google Auth since only the SMS is being phased out. Do you understand now or de we need to repeat this again and again?
So, when you said "The device has never existed", you realize how that was a bit misleading, right? The way you've been presenting this situation would suggest that Google enabled 2FA in an impossible manner.
The device existed. You ignored the warnings and wiped the device before transferring your authentication elsewhere. There's plenty of things to be critical of Google over, but flagrant user error like this isn't one of them.
There were no warnings, an unlocked bootloader was sold as a feature! The device was not set up for 2FA, it's just shitty design!
Clearly, it was.