[Solved][XBOX] Can't join any Multiplayer Online Session / Race F1 2019 Error NO7

[vMalte 0]

Hello,
since I got the game I can't join any online session, whether it's ranked or not.
I get the error "not able to join session" and sometimes with the additional error code "NO7".
My XBOX is connected to the Internet, I restarted my XBOX and Router and my XBOX Live Gold Membership is activated. The Multiplayer in other games works.
I couldn't find any solution for this problem...
I would love to play this game online...
Thanks in advance!

[vMalte 0]

Alright I finally solved it.

The problem was my Fritzbox. The Teredo-Filter was turned on. After turning it off everything works now!
I don't know why other games worked online...