After releasing an update for the Crimson Days event in Destiny 2, Bungie had to take the servers offline. They are back up, but people are running into issues trying to log on.
Destiny 2 Is Temporarily At Capacity
Unfortunately, there are just so many people trying to get into Destiny 2 right now that the servers are straining under pressure. It was to be expected, however. Pretty much the entire active population of Destiny 2 is trying to log in right now. When Bungie was forced to take the servers offline, it meant everyone playing the game got the boot, so now the entire active population is trying to get back in for Crimson Days and the weekly reset.
That is a whole lot of people currently bombarding the login servers. As such, if you are having login problems, the best thing to do is exercise a little patience. These problems have sadly become quite common since Destiny 2 moved to Steam.
All you can do is sit and wait until you get processed through the queue. I wouldn’t advise trying again, because you will lose your current spot in the line and all the people behind you will get to shuffle on a step forward.
Stay patient. The moon will still be haunted in a few minutes when you finally get into the game.