When trying to register or enable QuickBooks Desktop on Windows, a user might run into more than one error. Most of the time, an error message like "QuickBooks registration error" or "QuickBooks activation not working" appears because the QuickBooks licence information is wrong. Most errors can be fixed by double-checking the licence number and product code you obtained online or offline. However, if you get error messages like "We're sorry, but your activation was interrupted" or "The validation code is wrong" or "This service is temporarily unavailable," you'll need to do more troubleshooting to fix the problem. Follow the whole article until the end to find out how to fix a QuickBooks registration error with simple steps. Read More: