Network problems normally give these errors.
I think your post said that when you connect using your phone as the internet connection then it works.
When you use your normal internet connection it doesn’t work.
If so then you have a network problem.
In order for Roon’s @support team to better assist you, please provide a brief description of your current setup using this link as a guide.
Make sure to describe your network configuration/topology, including any networking hardware currently in use, so they can have a clear understanding of how your devices are communicating.