This type of error is confronted by the users either when the type the product key incorrectly or when they have entered the activation key to the wrong product. In order to fix this particular issue, you can try the following solutions or directly reach out to How to fix the issue of norton helpline number in lieu of technical assistance.
• Ensure that you have entered the product key in the right product as for every product there is a specific activation key
• Check that you have typed the key correctly. Carefully type it the way it appears
• Verify that you have logged into the corresponding Norton account to which the key belongs.
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Edited by user Wednesday, July 03, 2019 11:12:04 AM(UTC)  | Reason: Not specified