Seeing an error when activating Windows? Find your code below.
0xC004F050 — "The product key you entered didn't work"
Usually a typo or an edition mismatch (for example a Pro key on Windows Home). Copy-paste the key from your account instead of typing it, and make sure the key's edition matches. A Pro key can upgrade Home: enter it via Settings → System → Activation → Change product key.
0xC004C003 — "The activation server determined the product key is blocked"
The key cannot be used. Contact the seller for a replacement. KeyForPC customers: open a support ticket with the order number and we will replace it.
0x803F7001 — "No valid license found"
Common after reinstalling or changing hardware. Enter your product key again in Settings → Activation. If you replaced the motherboard, run the Activation troubleshooter on that same page.
0xC004F213 — "No product key found on your device"
Appears after a hardware change. Enter your key manually, or sign in with the Microsoft account linked to your licence and use the troubleshooter.
0xC004F074 — "Key Management Service could not be contacted"
The PC is set to activate via a company KMS server. Enter a retail key with slmgr /ipk YOUR-KEY then slmgr /ato in an administrator Command Prompt.
Still not activated?
Try again after restarting and checking that the date, time and internet connection are correct. If nothing works, our team offers free activation help — use the chat assistant or contact us. See also: How to activate Windows 11.