Troubleshoot QuickBooks Invalid Product Number Quickly When the program is unable to validate your license or product key, the error QuickBooks Invalid Product Number appears. Inaccurate entry, a membership that has expired, or faulty installation files can all cause this. Re-entering the correct product number, upgrading QuickBooks, or fixing the installation for correct activation could all be part of the solution. Call 1.855.738.2784 for expert guidance and help with QuickBooks. Read more: https://hackmd.io/@markwilliam8506/best-ways-to-fix-quickbooks-invalid-product-number-error