Hi! Trying for connect a family member’s phone to my Nextcloud to use Talk.
After starting Talk and entering the URL, the page “Connect to your account” opens and asks to log in to the account before granting access. Problem is that the [Log In] button is greyed out and I cannot do anything about it.
I tried using the standard browser to log in, but it did not recognize the open browser app but insists to do it within the Talk app, which does not work.
The only other link ”Alternative log in using app password” is clickable but does nothing either.
I’m stuck and there is no error message. 
What could be the problem and what can I try? Thanks!
PS. My Android is very old, v9 (LineageOS 16.0).