Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
1
Open Word, then go to File - Account.
On that window, you should see the Email address of the account used for the Microsoft subscription.
Log into that account on this link (https://account.microsoft.com/services/), do you find the subscription listed there?
If not, click the Billing icon on the left, do you see your subscription payment listed there?
2
If you are still unable to find your subscription, this forum is just a user to user forum, no-one here has any account access, you will need to contact Microsoft Support directly provide them with the payment details of your subscription and they should be able to find your subscription, 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