While this extension works fine on my MediaWiki version 1.34 installation and the main Vector skin it does not work with MinervaNeue skin as mobile user interface.
Topic on Extension talk:WebAuthn
Hi, can you be more specific with "does not work"? How does it fail?
Actually the WebAuthn opens a modal window on the Vector skin where it asks you to enable your device, that doesn't appear on the MinervaNeue at all.
If I switch to Vector skin on my smartphone it allows me to use WebAuthn, switching back after successful login to MinervaNeue works as well.
I tested it on a desktop with Firefox 68.7 too. Same behavior. With Vector skin you get a modal window asking to use your device for authentication, but that does not appear with MinervaNeue.
I have not found a place to report a bug so I try to do it here.
I have downloaded mediawiki 1.35.0 and then WebAuthn as well and enabled it. First I set up OATHAuth for authentication which worked well. Then I have wanted to switch to my Yubikey (why not support both methods?), enabled it, it said okay, then I could not login the next time with "verification failed".
This has happened on an Ubunut 20.04 LTS, php 7.4, GMP installed. The database is of an existing wiki, update.php was run.