https://www.gamespot.com/articles/destiny-2-ps4-errors-reported-bungie-investigating/1100-6453169/

Destiny 2 is a big, big game with a huge focus on multiplayer and online. Presumably due to the strain of loads of people coming online for launch, the game is running into some issues. Bungie acknowledged one of these issues on Twitter today, saying it's aware of and looking into a problem with the PlayStation 4 edition related to multiplayer permissions. The exact nature of the problem isn't immediately clear, but people are responding to the tweet to voice their displeasure with the state of things.

Here's what Bungie had to say: "We are investigating players on PlayStation 4 receiving errors indicating permissions to access online multiplayer may have changed."