Someone helped me with this earlier. Run it in compatibility mode for Windows 7
Try logging in from a Chrome Guest mode window. Does that work?
it does not, same behaviour
That basically rules out Chrome as the cause. Most likely it's your local network / your router's settings.
I am using a Powerline Adapter connected via cable to the computer and router.
I will try direct cable to the router once I find a 20meter long cable I had somewhere in the house and report back. Regardless, the powerline is giving me +80 megs of speed, IP is set to automatic, and have no firewall rules running on the router.
I will also try 2 laptops with all 4 wifi connections (poweline independent wifi in 2.4 and 5ghz lines and same for native wifi from the router)
Stadia is using some pretty fancy WebRTC + UDP connections - make sure your OS and router don't block these.