Bungie just say that the errors would already be resolved.
Some players of Destiny 2 would be experiencing problems connecting to your servers and the inability to enter the game during the last few hours.
Destiny 2 with problems on PS4
Bungie as PlayStation have warned the community that can occur irregular situations in the servers of the game.
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We are investigating players on PlayStation 4 receiving errors indicating permissions to access online multiplayer may have changed. Bungie Help (@BungieHelp) September 7, 2017
Everything seems to indicate that errors are being produced by connectivity problems linked to PlayStation Network and that would have intensified during this morning.
We are aware that some PS4 users have reported issues accessing PSN tonight. Thanks for your patience as we investigate. Ask PlayStation (@AskPlayStation) September 7, 2017
According to a message of laa development, the connection problems experienced during the last few hours would have already been solved.
Issues causing players on PlayStation 4 to receive an error indicating permissions to access online multiplayer have been resolved. Bungie Help (@BungieHelp) September 7, 2017
Currently, Bungie keeps active in various research to correct other problems detected in the game, and reported by the players.