Hello,
Recently I tried to set up the DCL/PDC feature in TopSky. However, when pilots sent me clearance requests, I received an alert stating: "Unable to receive list of online CPDLC clients."
My Hoppie code is inserted correctly, and as far as I can tell, the CPDLCSettings.txt file is also properly configured.
I have also tried restarting EuroScope and reloading the CPDLC option in the Plugin Status window, but that didn't solve the problem.