verification windows 11 pro

Use the following steps to resolve Windows 11 Pro activation after a clean reinstall:

1. Confirm activation status
   • Select Start > Settings > System > Activation and check the message shown there.
2. Enter the original product key (if available)
   • If there is a valid Windows 11 Pro (or qualifying retail Windows 10/11 Pro) key that was used on this same PC before the reinstall, enter it again:
     • Go to Settings > System > Activation > Change product key and type the 25‑character key.
   • If the key is rejected with errors like 0xC004C003, 0xC004C008, 0x803FA071, or 0xC004F034, the key may be invalid, already used on too many devices, or not match the installed edition. In that case, a different valid key is required.
3. Use the Activation Troubleshooter
   • In Settings > System > Activation, select Troubleshoot.
   • If a digital license is linked to the Microsoft account and to this device, the troubleshooter can reactivate it.
   • If a significant hardware change (like motherboard replacement) was made, follow the “reactivate after a hardware change” path when offered. For more detail, see Reactivating Windows after a hardware change.
4. Check for common activation error causes
   • If Windows reports that the hardware changed (errors like 0xC004F211 or 0xC004F213), the digital license may no longer match the device. In that case:
     • If Windows originally came preinstalled and the motherboard was replaced, a new license may be required.
     • If there is a product key previously used on this device, enter it via Change product key.
   • If the error indicates the key is already used on another device (0xC004C008, 0xC004C770, 0x803FA071), that key has likely exceeded its allowed activations and a separate key is needed for this installation.
5. Use phone activation (if applicable)
   • If there was a substantial hardware change and a valid product key is available, activation by phone can be tried:
     • In the search box on the taskbar, type SLUI 04, select it, and follow the on‑screen instructions.
   • Note: Windows 11 Pro EDU and Windows 11 Pro for Workstations must be activated over the internet; SLUI 04 cannot be used for those editions.
6. If all else fails
   • If the device originally had a genuine, preinstalled Windows and activation fails on first use, contact the device manufacturer.
   • If the product key is invalid or used beyond its terms, a new Windows 11 Pro license must be purchased from the Microsoft Store via Settings > System > Activation > Go to Microsoft Store.

References:

• Activate Windows
• Why can't I activate Windows?
• Reactivating Windows after a hardware change
• Get help with Windows activation errors
• Unable to activate Windows after reinstall - Microsoft Q&A
• Windows Activation when upgrading from Home to Pro - Microsoft Q&A
• Retrieve Product Key / New Windows 11 install - Microsoft Q&A
• Reactivate Windows 11 - Microsoft Q&A