Same as the guy up top. Could it be something wrong with whatever device you play on? Do you have someone you can log onto their machine to test it out on to see if the same thing happens? That way you can maybe narrow it down to a Bungie issue or a machine issue. Hard drives can start to go bad without complete shutdown. That sector on the drive maybe bad. Then again it could be an issue on Bungie's side as well. Just trying to give some ideas on troubleshooting. Hope you get it resolved Guardian. Good luck.

I have an xbox series X, I have this problem also on PC, I tried on several wifi nothing, I can't connect on my main account but on the other hand if I create another account the I can play and that I don't understand why 😐 but I saw on tweeter that a certified person had the same problem as us, and this person apparently has already worked with Bungie, so I hope this will make things move :)