The "QuickBooks POS invalid product number" error typically means some corrupted files in QuickBooks's Point of Sale function or the system has identified an incorrect product code. The error is often accompanied by the error code 176109. To resolve this, delete the contents of the entitlement client folder and re-enter your product and license number or reinstall the Point of Sale software altogether.
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How to Fix QuickBooks POS Invalid Product Number or Error 176109?
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How to Fix QuickBooks POS Invalid Product Number or Error 176109?

QuickBooks POS invalid product number is a very common problem. Read here to know effective fixes to eliminate QuickBooks error 176109.