i need help it doesnt let me inv or join also i cant do any challenges or aything pls help 
From the looks of it you didn’t intentionally create two identical threads, it may have been a bug, but FYI, don’t do that and stick to one.
As for a fix, restart your console, check your network status and make sure you have xbl membership and make sure you’re not banned.
If none of that works, and you have twitter, tweet Xbox support here.