I have been looking around and found several others with similar if not the same issue:
- Unable to Login to Roon on Windows Computer (ref#DQTIRS)
- Unable to Login to Roon on Windows (ref#TRA8QX)
- Roon login issue with Windows (ref#AC4WDS)
- Repeatedly asking for login at Roon start up
- Can't Start Free Trial On MacBook
Also I tried opening the Roon ARC app on my phone and I encounter the same issue there just trying to login. This indicates to me that it might be a server issue on Roons side. I hope this is helpful.