I don't know if this is intentional but it does not seem to be possible to login to this instance using a mobile app like Jerboa or Sync.
It might be related to your Cloudflare config, which seemed to have prevented me from logging in on web multiple times until I managed to somehow hit the challenge page.
Same problem here. I cannot use this instance from mobile unless using a browser... if you make the Cloudflare config a bit less aggressive would that enable us to use apps?