When a SharePoint Provider Instance is disabled and you re-activate the SharePoint Site Collection for the K2 App, the provider instance is not enabled during the re-activation, and you are unable to run a Sync via the SyncEngine.
- Ensure you have K2 Five (5.3) installed.
- Download the K2 Five (5.3) FP2 from K2 Partner and Customer Portal.
- Install the K2 Five (5.3) FP2 to apply the fix.
- Run the Sync again.