Hi all.
We have a one problem on ps4. When we try play together with ONLY (i mean if im gogikg to start party only with him) one of my friends and possible players. After inviting/adding players into party in diablo 3 game return game otification window with : There was a problem joining game"
We tried many options but without solution.
We both can connect to other players. But not each other. When someone third create party we can connect and play together.
We have :
Same NAT type B(2)
Actual ps system and game
same region in game
Same date and time settings
Tplink archer c50 and tplink c60 routers. Actualy port should be open when we can play with other players.
Where can be a problem?
How did you solve it ?
I google it with tens problem discussion, but every one of them without the real answer/solution
Thanks for your help 
Best regards
Fefe