Having problems with reactivating what I believe to be a valid Windows product key

To troubleshoot the issue with reactivating your Windows 11 product key, consider the following steps:

1. Check if Windows is Activated: Open the Activation settings by going to Settings > Update & Security > Activation. Look for any error messages that may indicate why activation failed.
2. Verify the Product Key: If you suspect that the product key from the BIOS was used, ensure that it is still valid. You can check if the device has a firmware-embedded activation key by running the following command in an elevated PowerShell:

      (Get-CimInstance -query 'select * from SoftwareLicensingService').OA3xOriginalProductKey
   

   If the output is blank, the device may not have a firmware-embedded key.
3. Device Association: Since you mentioned that the device was removed from your Microsoft account, try re-associating it. Log into your Microsoft account and check if the device is listed under your devices. If not, you may need to add it back.
4. Reinstall Windows: If the above steps do not resolve the issue, consider reinstalling Windows 11. During the installation, you can enter the product key manually if prompted.
5. Contact Microsoft Support: If you continue to experience issues, reaching out to Microsoft Support may provide additional assistance, especially if the product key is not being recognized as valid.

These steps should help you troubleshoot the activation issue with your Windows 11 installation.

1

Click your Start Button, type cmd then right click Command Prompt and choose 'Run as Administrator'

Run or paste this command and hit Enter:

slmgr.vbs /dlv

Please post a screenshot of the resulting dialog

2

Download the free ShowKeyPlus app from the Microsoft Store.

A

Please provide a screenshot of that app window and please hide any product key in the screenshot.

B

On the that app, click 'Check Edition', then enter your product key into that app.

Please provide a screenshot of that app window and please hide any product key in the screenshot.