Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello,
If you have a subscription, you don't have product key, the Microsoft account itself used for the subscription is the license itself.
Do you know which Microsoft account you used for the subscription? If you do, you can go ahead and install:
Please go to https://www.office.com
Sign into the Microsoft account you used for the subscription. Click on Apps on the left.
Then on the upper right, click on "Install apps". This will now download the installer file. Once downloaded, click on the file to install. It will install the Desktop version of the apps for you then.
If you are not sure what username you have with Microsoft, use this instruction here to see if you can recover the username:https://support.microsoft.com/en-us/account-billing/forgotten-your-microsoft-account-username-b2049472-3b8f-27d3-61c6-67a668453f4c