OK I had a problem with playing Ark Survivor, Every time i clicked Join Server i would get an error message, unable to complete action please check account privileges This was on PC, but may be same for Xbox as well
here is what I did
go to this link and sign in on your account
. Once done please choose Your account name and allow the Join multiplayer games
it will default to privacy, the tab next to that is the windows xbox tab, that is where you will click multiplayer games, scroll to the bottom and then click the save
the next tab is the regular xbox tab, also the same, click multiplayer games and at the bottom click the save, the save is very important if you do not click save it will not save or did not for me. i really hope this helps a lot