When you mention Tidal files aren’t available, do you mean they’re actually listed as Unavailable within Roon, or are you having problems with playback?
Please first try signing out and back into Tidal in Roon Settings → Services directly. From there, reboot your RoonServer machine.
Hi Connor, txs for reaching out so quickly! And thank you for the advice, ir works now. This is such a great community. Have a great weekend, Best, Johan