I am using an enterprise key for SharePoint that is not trail and also not my own , but I need to change it to my own license key
Is it applicable?!
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You cannot change the product key in any supported manner. In general, Microsoft doesn't care what product key is in use as long as you hold a valid license. But if you feel you have to change the key, you'll need to re-install SharePoint and leverage a new Configuration database.
Credit goes to @Trevor Seward link