Invalid key for activation

The key I have received does not work. Error message: Invalid key: The product key entered is not valid.
What can I do. There are no solutions by the support (chat etc.). Is there a phone number for the customer service ?

Hello @utilisateur207
How did you receive the key?
What Norton plan are you trying to activate?

Using your Norton product key
https://support.norton.com/sp/en/us/norton-download-install/current/solutions/v54413149

Enter your Norton product key
https://support.norton.com/sp/en/us/home/current/solutions/v89978947

Message: “Invalid Product Key”
https://support.norton.com/sp/en/us/norton-download-install/current/solutions/kb20090504170737EN

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