Using Firefox on both. As noted Desktop is no problem and happens instantly. On my phone (iOS, Firefox), on a regular tab, the button shows the busy animation indefinitely. No console of course so I don’t know what the error is. But if I open an incognito tab, it signs in instantly. FWIW it is the same on sh.itjust.works Edit, also: it works fine on iOS Chrome ad Safari in a regular tab. Maybe a firefox bug or… hmm