Between an iMac and MacBook Air, I use Finder Tags extensively. Normally, they sync without effort on my part. The Finder Tags are no longer syncing automatically. How can I 'force' synchronization and control that the MacBook Air updates the iMac and not the other way around?
Here is a manually solution: open Finder -> preferences -> Tags. Look at the 'Favorite Tags' part, then you can drag/delete/add tags to your current right click menu (in your current mac)
Logging out of iCloud then logging back in can resolve some of these hiccups in properly syncing settings across devices. It's a pain but might work.