Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hello, thank you for reaching out to Microsoft Q&A.
Microsoft does not provide a product key for Microsoft 365 subscriptions purchased through the Microsoft Store. Instead, the license is digitally associated with the Microsoft account you used to make the purchase.
To check if the license is assigned, visit the Services & subscriptions page for your Microsoft account.
https://account.microsoft.com/services
From there, you can manage your Microsoft 365 Family subscription and send invitations to your family members to have the subscription.
Let me know if you still need more help.