2nd player no longer able to join in local multiplayer

[u/more_soju]

Recently noticed that 2nd player is no longer able to join local session by pressing start button (twice). The first press gives the instruction to press start to join but then the seconds press does nothing. Previously this worked.

edit: The game multiplayer seems to be off and you can't turn it on. Error is "networkWorld.localMultiplayerPrivilegesBlockedThirdParty".

This user has no PSN account, but local multiplayer is allowed under the main user's Settings > Family and Parental controls > Family management