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Microsoft 365 and Office | Install, redeem, activate | For home | Windows
Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
If you purchased a Microsoft 365 subscription from a 3rd party retailer, did they provide you with a product key card, and if so, did you loose that key card?
If that is what happened, then you first need to contact that retailer to ask them if they can provide you with a replacement key card, if not, this forum is just a user to user forum, you will need to contact Microsoft Support Directly, provide them with proof of purchase and any other details you may have and they may or may not be able to find the associated product key, try using this method to contact their support.
Go to this link: https://support.microsoft.com/contactus
Select Microsoft 365
Click 'Get Home Support'.
In the box provided, type billing.
Press Enter, then on the next page, scroll down and click 'Sign in to Contact Support'.
Navigate to Microsoft 365 and Office - Manage my Subscription.
Select the 'Chat with support agent in web browser' option