Not everyone who has a Microsoft 365 subscription knows that it can be renewed at any time, not just shortly before it expires. This can be important when a sales promotion offers a better price for a Microsoft 365 Family or Microsoft 365 Single product code.
Go to https://setup.office.com, click on the Sign-in button and sign in with your Microsoft account, which comes with a Microsoft 365 subscription.
Enter the product code, click Next to approve it, and follow the on-screen instructions. You can find out how long the subscription has been running by clicking on the username in the top right-hand corner and selecting My Account.
On the page that appears, under Subscriptions, select All subscriptions to get the information you are looking for.