The remember the browser function was a big step forward for everyday usability.
I would also like to see a fallback option integrated in case users can no longer access their authenticator app, for example if their phone is lost or stolen.
Currently, access can only be granted via manual administrative intervention, which is particularly inconvenient for users without access, in larger communities for admins, too.
I am aware of these options, for example:
- Hetzner's consoleH provides a recovery key via snail mail
- Users can generate multiple stock emergency keylists for download, e.g. LinkedIn 5 pieces or Facebook 10 pieces
- On Xing, this is limited to one, but can also be generated at any time
Personally, I think one code would be enough, but a few more certainly won't hurt for some users.