It doesn’t work for me either, with F-droid Fennec. Clearing cache/cookies/history/everything does not help, so don’t suggest that. I installed Jerboa because of this. I have no other way to log in from my phone. Well ok, maybe with Chrome, but that is a bridge too far.

I don’t know about login, because I was unable to create an account. It was stuck, not doing anything with just the spinner on the submit button forever. Tried disabling adblocks, using different browsers and the same effect always persisted. I gave up on signing up to the instance

How are you trying to login? I know Jerboa is broken right now.