Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
In Word on the laptop, if you click File > Account, which e-mail address is indicated at the right hand side of the screen (under "subscription product")? For privacy and security reasons, you should not repeat the e-mail here, but you can try signing in with that e-mail at https://account.microsoft.com/services which should show you the subscription.
Note that the account you are using to keep the subscription activated doesn't have to be the same account that you use to access OneDrive files or sign in to Windows.