Can you assist me with a solution to the above problem? I face the same issues: I have access to Tidal via phone, web interface; I get an error retrieving account info on Roon, I have no access to internet radio and Tidal. I run Roon 1.6 on a NUC7.
I suspect the new network router (recently renewed by the provider) is involved in this problem, but I can not find any guidance setting this new router up properly for Roon. Never had an issue with the old router.
So we can better assist you, please describe your network configuration/topology, including any networking hardware currently in use, so we can have a clear understanding of how your devices are communicating.