You cannot invite players to your fireteam unless you are playing Destiny 2 and are in Orbit with open Fireteam slots. If you meet these requirements yet are seeing this error, check to make sure that you have not set your profile to an "Appear Offline" state.
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Edited by LordEros36: 12/3/2020 7:00:44 PMIt was a new setting for me, under personal info|messaging in ps4, had to change Online Status and Now Playing.