We sync with both QuickBooks desktop and QuickBooks Online (QBOE).  To begin to resolve your sync error you should always do the following:

Step #1. Run an empty sync.  An empty sync is when you remove all invoices from the Ready To Sync queue and run the sync without any invoices.  We do this to ensure there are no other underlying issues with the sync.

Step #2. After running the empty sync are there any error messages in either your Quickbooks webconnector for desktop users and for both types, QBOE included, are there any errors in your Kickserv Quickbooks error page?

Step #3. What is the entire error?  If there is an error message you can now copy and paste that message into our search box at help.kickserv.com 

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