0xC004F034
Invalid key or key for another Windows version
Windows does not accept the product key. Microsoft gives two reasons: the key is not valid, or it belongs to a different version of Windows. On a device managed through a company KMS server, your organisation handles activation.
Symptoms
- Windows shows 0xC004F034 after you enter a product key on the Activation page.
- The code also appears on devices that activate through a Key Management Service (KMS) server in a company network.
Causes
- The product key entered is not valid.
- The product key belongs to a different version of Windows than the one installed on the device.
How to fix it
Check the installed version and edition
Select Start > Settings > System > About. Under Windows specifications, the line Edition shows whether Windows 10 or Windows 11 is installed and which edition, for example Windows 11 Pro. Compare it with the product on your order.
Enter the key that matches
On Windows 11, select Start > Settings > System > Activation; on Windows 10, select Start > Settings > Update & Security > Activation. Select Change product key and enter a key that matches the installed Windows version and edition. Copy it from your order email or your account library to avoid typing errors.
Company devices with KMS
If the device belongs to an organisation that activates through a KMS server, contact that organisation's IT support. Microsoft points to them for activation in a KMS environment. Lizensa does not sell KMS host keys; Lizensa keys activate with Microsoft online or by telephone.
Contact our support
If the installed Windows version and edition match the product on your order and the error persists, contact our support with your order number, the installed edition and the full error message.
Where to find your key
Your 25-character product key is in your order confirmation email and in your account under My Library. Copying it from there avoids mixing it up with a key from an older installation, a device sticker or another order.
When to contact our support
Use our contact form. Support answers Monday to Friday, 09:00 to 17:00 CET.
Version and edition guides
- Windows 11: matching the edition to your key
- Windows 10: does your key fit the installed edition?
- Windows Server: which installation do you have?
- Changing the edition with your key: Windows 11, Windows 10, Windows Server.
Related codes
- 0xC004F210: the key does not match the installed edition, or the installed edition does not match the digital licence.
- 0xC004F050: Microsoft documents it as the Software Protection Service reporting the key as invalid.
- 0xC004F074: the error message says that no Key Management Service (KMS) could be contacted.
Still need help?
If error 0xC004F034 keeps blocking activation after these steps, our support team can check your key and license channel directly.
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