Hi there, @SandyMc1.
I appreciate your research and follow troubleshooting to resolve the error "Warning 176109 Invalid Product Number". This error will like to appear if the key authentication files are corrupted or missing.
Another option to fix this error is to manually delete the contents of the Entitlement Client folder found in the Program Data folder. Usually, this is hidden, but you can unhide it by following the steps outlined in this article: Display hidden files and folders in Windows.
Once done, proceed to delete the contents of the Entitlement Client folder. Here's how:
- Press the Windows key ⊞ + E, to open Windows Explorer.
- Go to C:\Program Data\Intuit\Entitlement Client\v8.
- Press Ctrl + A on your keyboard to select all the files in the folder, then press Delete.
- Select Yes to confirm the action.
- Re-launch QuickBooks Desktop Point of Sale and complete the registration
For more troubleshooting steps, check out this article: Error code 176109: Invalid Product Code or Invalid Product Number. It also contains a contact number to verify the correct validation code used in case the issue isn't resolved.
For future reference, read through this article to learn more about fixing QuickBooks Desktop POS installation errors in case you encounter one.
Get back to me and let me know how these steps work for you. I want to make sure you're all set. Take care!
