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Google will send you codes to devices that don’t even have the app installed. Ask me how I know.

Wait, what? How does that work?

It doesn't :P

use AndOTP with QR code from fdroid. Go to account settings in desktop browser and remove the phone as 2FA. It will not ask any code to device.

Google somehow seems to think I own this device despite it not being one of the devices on my account.