https://www.gamespot.com/articles/destiny-2-pc-launch-issues-buffalo-error-crashes-n/1100-6454326/

As was the case with its launch on consoles, things appear to be going pretty smoothly for Destiny 2 now that it's available on PC. There are, of course, inevitable issues that have begun to pop up, and Bungie has offered a rundown on those that it's aware of and some possible workarounds that you can try to resolve them.