I have been accessing the instance using Firefox and it’s been working great but I wanted to try to log in with safari because that’s the only mobile browser where I can add a website to my Home Screen.
I enter my login information and hit login and then I get the spinning circle that spins indefinitely.
You have to put your email address you used when you signed up, not your user name, into the login field, otherwise the forgot password link does nothing.
I'm also facing the same issue and was using Samsung Internet Browser on Android (just made a whole ass thread about it until I found this discussion). I suspect that it is a server side issue.