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

Error

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

Explanation 

This error occurs when an invoice marked to be emailed is trying 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.

Solutions

  • Add a valid email address to the customer in Bill.com and QBO
  • Uncheck the "to be emailed" box on the invoice itself