Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hi,
I am afraid the product key must be associated with the Microsoft account. This is something by design.
The reason Microsoft does this is that, in case you forget the product license, you can restore it using the associated Microsoft account. Microsoft account creation is free as you may have already known by now.
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I look forward to hearing from you to get the results of the troubleshooting.