Jennifer Stuber · @bubblywums
28th Jul 2017 from TwitLonger
Snapshot 10/Snapshot 16/SimpleSky Joining Official Server Issue
Due to some changes that were made to how data is saved on PS4, it appears that the previously existing data may be inhibiting the ability to join official servers.
Warning: deleting this data will RESET the data, including: explorer notes, the mini-map, and achievements (will have to get them again to get the reward skins). You will have to get/unlock these again once the data is deleted. Deleting this data will not affect your characters or singleplayer saves.
Navigate to: PS4 Settings > Storage > System Storage > Saved Data > ARK > Delete Local Profile.
After the file is deleted, you should be able to join your server again.
PS: If the above alone does not work, you can also delete your config file (though I don't think it's necessary). This will reset your game settings, such as the settings in your option menu.