Can't connect to friend

Since the Reach update I’ve been unable to connect to a fireteam with my friend. We are both on the same connection / router, not sure if that makes a difference? We can connect on any other game fine like MCC (which is a surprise I know)

Pls help!

Try reseting H5 if that doesn’t work turn off your Internet thing wait 10 seconds turn it back on if that doesn’t seem to work try hard resetting your xbox 1