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.
Do you have any local (non-Tidal) content? Does the same issue occur?
If you play to System Output of the Core or a remote does it work?
I think I solved the problem. I guess I had a network connection problem.
I disconnected the cat 6 cable from Bluesound node and remove it from Roon and made it wireless.
Then I Installed it again in Roon and it works well, but in this case wireless.
So the Roon core on the Apple Macmini is internet wired en The Bluesound Node DAC streamer is wireless. It plays allright for me but I think I should it make internetwired again.