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Here's how to Fix Office Activation Error PIN-INAPP-INVALIDPIN-8.

i. Here are some solutions you can try to fix the Office Activation Error PIN-INAPP-INVALIDPIN-8:

* **Check your internet connection.** Make sure that you are connected to the internet and that your connection is stable.
* **Restart your computer.** Sometimes, a simple restart can fix the problem.
* **Try again later.** The Office activation servers may be experiencing temporary problems. Try again later and see if the problem persists.
* **Contact Microsoft support.** If you are still having problems, you can contact Microsoft support for further assistance.


If you are still having problems after trying these solutions, you can try the following:

1. **Check your product key.** Make sure that you are using a valid product key. You can find your product key on the Office installation media or in the email that you received when you purchased Office.
2. **Try using a different product key.** If you have multiple product keys, try using a different one to see if that fixes the problem.
3. **Repair your Office installation.** You can repair your Office installation by going to Settings - Apps - Apps & features - Microsoft Office - Modify.
4. **Uninstall and reinstall Office.** You can uninstall and reinstall Office by going to Settings - Apps - Apps & features - Microsoft Office - Uninstall.
5. **Contact Microsoft support.** If you are still having problems, you can contact Microsoft support for further assistance.

ii. Here are some other known errors that can occur when activating Office for Windows:

* **Error 0x8007007B:** This error occurs if there is a problem with the Office installation or activation process. To fix this error, you can try the following steps:
* Restart your computer.
* Run the Office troubleshooter.
* Repair your Office installation.
* Uninstall and reinstall Office.
* Contact Microsoft support.

* **Error 0x80072F80:** This error occurs if there is a problem with your product key. To fix this error, you can try the following steps:
* Make sure that you are using a valid product key.
* Try using a different product key.
* Contact Microsoft support.

* **Error 0x80070422:** This error occurs if there is a problem with the Windows Store. To fix this error, you can try the following steps:
* Restart your computer.
* Run the Windows Store troubleshooter.
* Reset the Windows Store cache.
* Contact Microsoft support.

* **Error 0x80072326:** This error occurs if there is a problem with your Office subscription. To fix this error, you can try the following steps:
* Make sure that you are signed in to the correct Microsoft account.
* Check your subscription status.
* Contact Microsoft support.

* **Error 0x80070005:** This error occurs if you do not have permission to activate Office. To fix this error, you can try the following steps:
* Run the Office troubleshooter.
* Repair your Office installation.
* Uninstall and reinstall Office.
* Contact Microsoft support.

* **Error 0x80070020:** This error occurs if there is a problem with the Office installation file. To fix this error, you can try the following steps:
* Download the Office installation file again.
* Repair your Office installation.
* Uninstall and reinstall Office.
* Contact Microsoft support.

* **Error 0x8007007B:** This error occurs if there is a problem with the Office compatibility. To fix this error, you can try the following steps:
* Check your computer's specifications.
* Repair your Office installation.
* Uninstall and reinstall Office.
* Contact Microsoft support.