How to invite people to play Senran kagura peach beach splash game?

Does anyone of you know the game and can tell me how you can invite other people to ps4 so that you can play this together? Thanks in advance.

So for me it works by opening the menu and it says invite friends.

with you ned?

No, strangely enough, it never says anything to me, to a buddy and not to me

Hm, strange, maybe. Uninstall the game and download it again…