Unable to access Multiplayer

[Dodo98]

After creating a new server game challenge and leaving the multiplayer room I wanted to log in again 20 minutes later but with no success. The game tells me 'Wrong credentials' when I try to log in. I thought maybe it's something with my Matrix account but I can log in here normally.

[Dodo98]

After another try I got this error message: *Line 1, Column 721 Syntax error: Left-over characters in stream after parsing a JSON value