How fix this error?
I did change DNS, but this didn't help
Was facing the same issue - "Failed to download configuration files from Bungie servers error code: nightingale"
What did the trick for me is to change DNS to google (8.8.8.8 and 8.8.4.4), got the solution from this thread
https://www.bungie.net/en/Forums/Post/236965675?sort=0&page=0&path=1
I've also disabled IPv6
Played a game for about an hour, tied re-launching it a couple of times - work fine for now