Having run into an error with my current version of my catalog in Lightroom Classic CC, I restored to yesterday's backup. However, when I try to sync with Lightroom CC I get an error message stating 'Problem syncing with current catalog. This apppears to be a duplicate or automatically created backup of your catalog. As it may not be current, sync has been disabled for this catalog. To make this your sync catalog, please relaunch Lightroom and enable sync.'
The statement is correct, it's a backup copy, but it is now my current one, so I need to 'force' a sync with CC. Upon relaunch, as suggested, I just go round the same problem. So the server won't accept that the version I'm using is the one I want to use.
That isn't a great user experience as you're getting an error message " Problem syncing with current catalog" while trying to sync images from Lightroom Classic , we're sorry to hear about this. Let us help make it right.
Could you please try the steps below:
1) Close Lightroom
On Mac it's at /Users/<user>/Library/Caches/Adobe/Lightroom/Sync Data/Sync.lrdata
On Win it would be at C:\Users\<user>\AppData\Local\Adobe\Lightroom\Caches\Sync Data\Sync.lrdata
OR Select the option: Classic -> Preferences -> Lightroom Sync -> Press alt/option -> Click on Rebuild Sync data.