We have tried everything to be able to play together but nothing is working. Invite just simply don't go through no matter where you are in game (Tarsis, Free Roam, mission, etc.).
Are you trying to invite your friends during those Activities?
Have you tried inviting them when you first get into your Javelin in the Fort, from the Social Menu?
I have similar problem.
Tried invite to squad while in javelin and outside. Tried while doing expedition and not and friend just will never see it.
On the other hand I can join him without problems each time he invites, but he seem to have connection issues and there's good chance it would be better if I would be lead as I have better internet connection .. .
I'm having same problem I can invite them but I never get invite it's like it never comes through I've tried lots of thing but no point even on both ends
Same issue here too- My wife and I are both in the same room and while she can send me invites (and i get the origin overlay pop up etc) when i click to invite her to squad, nothing happens at all and she doesn't get a notification. Our origin settings are identical. After testing in other games (Apex for example) the feature works as it should both ways.