I can invite my friend to a squad, however when one of us accepts the other's invitation, a message comes up saying "Connection to Host Failed."

My NAT is shown as Strict so I think that's the problem.
I've set all ports, tried turning off windows firewall, however my NAT still remains Strict.
My friend's NAT is moderate so I'm guessing his side isn't the problem.

Anybody have a solution?

Anyone? also, whats the advantage of being in the same squad?

i have like the same issue, have no clue on it ...
still no solution?

ill try some portforwarding now,

Working on it for f******* 2 days.
All Ports are open => NAT STRICT

I dont know why.