[Cant Join Or Invite 1 Friend But Can Through Others]

My wife and I have a similar issue. We often find that one of us can see the other online but not the other way round.

Invites sent from the one that can see don't get received.

With a friend online too the one of us that can see the other online will be able to invite or join our friend but the other can't.

Incredibly annoying intermittent problem. Probably down to bad netcode that isn't playing nicely with two xb1's behind same router. Unfortunately too many games have this issue early on after release. :(