Sign in Problem "Internal Server Error. Something went wrong on our end"

Plex Media Server
2

That helped. The TIDAL Link was the Problem!

  1. Go to your https://app.plex.tv/desktop#!/settings/online-media-sources account page and disable the Music/TIDAL provider
  2. On your https://plex.tv/users/other-services account page, unlink TIDAL, and then link it fresh
  3. Back on the Online Media Sources page, enable the Music/TIDAL provider again
  4. Wait 10 minutes for changes to propagate