A service that I used has switched to mandatory 2FA, supporting Google and Microsoft methods. This works fine on Windows with WinAuth using the Google method, where I was able to feed in the URL of the QR code.

For Linux, I've installed flatpak Authenticator on my Ubuntu Mate 18.04 system and unfortunately the service I need to access is not in its supported list. Is there a way to add it? There is no documentation that I can find on Authenticator. (I guess it's supposed to be so easy to use that no docs are needed.) The "Scan QR Code" button appears to do nothing and it is not obvious how this function is supposed to work. So for now I can only authenticate from Windows which is a PITA. Anyone familiar with this program?