Xbox Party Connection

There isn't a problem with my Xbox Live connection and my Xbox doesn't warn me about any NAT issues. I don't know why my connection is like this, but when I play I usually have 3-4 connection bars and can play usually without lag. When trying to join my
friend's Xbox Live Party, I get the message popup in the top right "Can't connect to Party" and if I hit the center Xbox button on the controller, the party tab says "Cannot connect to Xbox Live Party. There may be connection issues." I can however, connect
to Xbox Live and play online.

For the Mic issue. It may not be your problem, Certain people have connection issues that are disconnecting the chat with your party overtime they join your party. You must leave the party and then invite them to your party and make sure that you are party
leader and that the connection is good before inviting the other members of the party. Close the party and if they still can't hear you ask them to unplug the mic holder from the controller and unplug the wire from the xbox. if the wire is not plugged into
the xbox then they need to install their controller and their headset to the xbox one.

This is not really a FH4 problem but a Xbox problem. It is just that fh4 uses the same connection as xbox live and party connection

Still having the problem. Sorry none of the solutions worked and my Nat is open not restricted

A main reason for that would be if you accidentally turned on a setting in the parental controls which blocks you from talking to anybody, if you still have the problem after checking reply back and i will find the solution