QuickBooks Online - Error message on Sync when syncing Invoices
Resolve invoice sync errors by adjusting your time data export settings in the QuickBooks Online Timesheets tab.
When you get the following error while syncing invoices to QuickBooks Online
Go to the QuickBooks Online Sync Settings and click on the “Timesheets” tab.

If you do not need to export time data, check off the checkbox “Export time data”.
If you need to export time data, then make sure the checkbox is checked and add a date to the 'Import timesheets on or after' field.

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