I say your post so I thought I would check.
There are currently 2 games up on East1 and I was able to join both servers.
I don't think I have ever had the error message you got but it might be Steam.
I had an update to Steam this morning and had to relaunch so that might your issue.
I opened a new steam account and it logged in fine. Something about the "Duplicate Request" makes me think that the server had some "ghost" of me still registered being there.
Ryujin wrote:QUOTE (Ryujin @ May 19 2018, 11:57 AM) I opened a new steam account and it logged in fine. Something about the "Duplicate Request" makes me think that the server had some "ghost" of me still registered being there.
Restarting Steam fixes that "ghost" issue. If not, rebooting certainly will. Been there, done that.