Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Did you sign up via Microsoft directly? Is the subscription listed online in your account anyway but you just don’t see a product key?
Subscription doesn’t come with the key. The account itself is the license. If you see your subscription listed in your account online you should find the download option to download the installer and install it. Once installed just sign into your Microsoft account on the apps to activate them.