After I finally made the choice to buy the game after hearing how fun and buggy it is, I noticed I had friends who have been playing already by making private matches and sometimes just waiting it out to join a public match. When we noticed we had enough people for a private match and they decided to invite me, I noticed that I could not join them. Neither their game or party in-game. I'd accept the invite and nothing would happen or change in-game. I'm thinking it could be something that needs to be port-forwarded through my internet connection. I've reinstalled the game and still receive this problem. I've done some of the normal Ps4, which is the system I'm playing on if that matters, ports through my modem to see if it helps, as through test, it makes my connection go from strict to moderate in other games with a nat type of 3. Will update this if possible if I find a fix or if port forwarding has helped. The game is great! Just sucks to have to go off of hope in finding matches within 5 or 15+ minutes.
*Edit* - I can now join friends, parties, and matches effortlessly. Either the update, porting, or both, worked.