Seems there is a problem for quite a lot of people who cannot join 1v1 duels, everything else works fine and they have followed the troubleshooting steps for PC but nothing works.

All other gamemodes run fine it is just the 1v1 that does not work.

It just searches and searches and after a loooong time I get this message

"Matchmaking failed. Returning to main menu. (0002000116)