You need to friend each others characters in game first
Then it should work just fine
If your all playing on the same account then the names should just show up, so assuming you each have your account the above applies needing to friend each other
You have to be friends in PSN, when you create a character it ask you if you want to add your PSN friends.
You can do it even leater but I don’t remember exactly in which menu…
Can you have the same-console accounts send each other friend requests by manually typing the PSN ID? Alternatively maybe you can log into myPSN on a computer or phone and try to manage it that way
edit: just saw your clarification, nvm. Go to Character Select, then select the Character you are currently using… should be a dialog to Add PSN Friends
From the touchpad menu, go to “Character Select” and if you click on your current character there will be a button underneath that says “import friends from PSN” (or something like that). They should then be on your friends list in game. If they create more alts, you will have to redo this in order for the new character to show up.
That could be idk however if it becomes to much of a hassle let me know I have a few extra hundred plots I would gladly lay down and give you all permissions to (may have jumped the gun when game first released…)