Need Product Key

It depends on how you purchased the renewal. If you got it online from a third-party seller, you often get a product key, sent via mail, for example.

Hello, good day and thanks for your question. I understand that you are looking for the product key for the Microsoft 365 that you have purchased.

Microsoft 365 is a subscription based service and there is no product key or license number to it as it is tied to your Microsoft account.

You can go to account.microsoft.com/services and login with the Microsoft account that you have used when you made the purchase and from there you can check if your subscription is still active or not as it might also be on a different account.