Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
You install via the MS Account
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Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
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Installation is always made via the associated account at https://account.microsoft.com/services as Palcouk has already pointed out.
After the very first installation, there is no need for a product key, and in fact you can't use the key more than once.