I get this message whenever I try to enable the sync for settings and favorites. I'm signed into iCloud on the machine I'm running Cookie on and the rest of my iCloud services are working normally. What am I missing? Thanks!
I found this thread with a similar issue, but it sounds like that user is logged in:
I get an error message stating that I need to open System Preferences and sign in. I'm running OSX Catalina, 10.15.7.
I sorted this myself - it wasn't working because iCloud Drive wasn't enabled. I don't use ICD for anything so I didn't have it turned on. Hopefully this helps anyone else coming across the problem (a blurb about that in the preferences might be a good idea).