Why the Sync Error occurs
This error occurs when an international vendor is attempting to sync from QuickBooks Online to Bill.com but the vendor's address is missing or doesn't match the vendor's currency in QuickBooks Online.
How to Fix the Sync Error
Edit the vendor's address in QuickBooks Online to match the currency of the vendor in QuickBooks Online.
For assistance on editing the vendor in QuickBooks Online, please visit the QuickBooks Online Help Center (you must be logged in to QuickBooks Online to access their Support Center).