1] Check if your Microsoft (Office) 365 Subscription is Active. If you have an Office subscription, you first need to check if the license is still active.

Repair your Microsoft 365 apps; Let us talk about them in detail. 1] Check your plan. ... If your product key is not valid, then maybe it got expired, or the key has been blocked.

Call Microsoft customer service at 1-800-Microsoft (642-7676) to request a replacement product key; a credit card fee may be required. References Microsoft: Where do I find my Windows 7 Product Key?