Hello,
My complete installation of Roon is working perfectly except the Webradios.
I tried to add several stations with recent adresses perfectly working outside of Roon.
I tried out the examples that you gave and they were added and played for me. Are you receiving any error messages? Can you share a screenshot of what you’re seeing?
Since noticing this behavior have you tried rebooting your Core machine and retrying? Give that a go if you haven’t already.
So we can better understand what you’re experiencing, 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 we can have a clear understanding of how your devices are communicating.