Why the sync error occurs
This error occurs when an invoice in Bill.com has been updated or created and is attempting to sync to QuickBooks Online, but the customer on the invoice is deleted in QuickBooks Online.
How to fix the sync error
There are two ways to resolve this issue:
In Bill.com
- Edit the invoice
- Select an active customer
- Sync again
In QuickBooks Online
- Reactivate the associated customer
- Sync again
