I’ve had no problems connecting with Tidal other than occasionally having to log out and log back in. Now every time I log in via my web browser and link back to Roon, it fails to link to Tidal.
Sorry for the troubles, @Robert_Wilke!
So we can 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 we can have a clear understanding of how your devices are communicating.