Alas I can't as it appears there's another bug
We can make private group etc, bug once joined can't wing up, or chat etc. Can see each other on map though.
Interestingly we can't even chat to each other even if both in start menu.
Have sent a ticket off on Friday, anyone else ran into this annoyance?
I had some similar problems when playing with a friend initially.
1. We needed to join the same private group - one of you create one, and then the other has to send a request to join and the one who created has to accept it. I'm assuming you've already done that, since you said you made a private group.
2. Both need to join that private group when starting, obviously, once it's been made.
3. Once in game, one of you send a wing invite and the other accept it. If you're not in the same instance after that, one of you supercruise out for a second and back in, though almost every time we ended up in the same instance immediately. (sometimes only one of us could send a wing invite for some reason)
I'm just throwing that out in case there's something there you didn't do - it sounds more likely it's some kind of bug. Just so you know, we played sitting in the same room through the same router. If that's your situation then it definitely can work, as it's worked no problem for us.
Hope it gets worked out - good luck!