"You have lost connection to the Destiny 2 servers. Your permission to access online multiplayer gameplay may have changed or you may be signed in elswhere." WHY?
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Is your PSN subscription up to date and active? If so try..... Clearing your systems cache. If that does not work... Log out of your gamer account (if you have a second account on your system log into and then out of that) then manually log back into your player account.