Can't login on mobile

This might be by design, but I find it quite frustrating that I can access this site via mobile (Android, Galaxy Fold) but can’t login.

The login / signup buttons are hidden, and when I go to login via Discourse Hub I just get a nginx/1.21.6 502 Bad Gateway. This also happens when I force desktop view in the site or via the browser (Chrome).

The reason I find this frustrating is that I manage my Discourse notifications via mobile. But not for this site!