Thanks for writing in, and welcome to the community!
Since you are using a Windows PC, I would verify that both Roon.exe and RAATServer.exe have been added as exceptions to your Windows firewall.
You can use these instructions to add the exceptions and the executables themselves would be located in your Database Location/Application folder path.
I would also add these exceptions to any Antivirus or other Firewall blocking applications you may have and ensure that you connected to your network via a Private network, not a Public one, see this guide for more information.
Do you already have a Qobuz account? Are you able to log into your Qobuz account directly, outside of Roon?
If you haven’t yet, please stop Roon Server from running, and power down and reboot both your router and server machine. Let me know if that helps you gain access to your account afterward. Thank you!