QuickBooks Online Sync Error: Business Validation Error: You must enter the email address for this customer in order to email statements.

Why the Sync Error occurs

This error occurs when an invoice marked to be emailed is attempting to sync to QuickBooks Online (QBO), but the customer is missing an email address in either Bill.com or QBO or the email address is invalid.

How to Fix the Sync Error

There are two options to resolve this issue:

  • Add a valid email address to the customer in Bill.com and QBO
  • Uncheck the "To Be Emailed" box on the invoice in Bill.com