Tested with the following apps:
- FreeOTP Authenticator (open source) Availabe via F-droid, Google Play, and Apple's App Store
- OTP Authenticator (open source) Availabe via F-Droid and Google Play. It features a built-in QR-code reader.
- Google Authenticator (proprietary)
Once you enable OTP with Two Factor Totp, your aplications (for example your Android app or your GNOME app) will need to login using device passwords. To manage it, know more here