Not sure if your question has already been answered elsewhere, but I'll still answer. Far Cry 5 Co-op is weird. You have to be at the main menu and hit the button on your controller next to "In-game party". From there, you can send your friend an invite. Once he's accepted the invite, back out and continue your game. Your friend should spawn in.
Far Cry 5 > Player Support > Topic Details. Jynn Apr 19, 2018 @ 9:59am. Can't Invite Friends to Co-Op. I have the in-game setting turned to 'on', i"m out of the tutorial starting island. DOes anyone know why my friend cannot accept my invite to join my game?
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far cry 5 coop not working