The key is still valid, you may alternatively try the telephone activation.
1. On the Activation Wizard window, click Back, then select the I want to activate the software by telephone option to make use of Microsoft office telephone activation, then Next.
2. Select your county/region from the dropdown menu, and call the toll-free number provided.
- If you see a notice that 'Telephone activation is no longer supported for your product' you can ignore this. You may still complete the phone activation by calling the Microsoft Office Licensing Activation Centers in your country. See your country and telephone number/s to call here.
3. When you call the Activation Center, you'll be asked to provide the installation ID (displayed on your screen).
4. After your installation ID is verified, you'll receive a confirmation ID. In the Activation Wizard, type the confirmation ID in the spaces provided at the bottom of the screen, press Next and then Finish.
If you didn't receive any confirmation ID, please follow this video on How to get a Confirmation ID.
NOTE: If you're still having trouble, please feel free to open a new support ticket and include the details below so we can assist you better:
1. Order / Transaction ID
2. PayPal email address and/or Delivery email address (if different from PayPal email address)
3. Type manually the product key (code or pre-loaded account details)
4. Screenshot of the pop-up/error message
5. Additional information (if any)