To activate Windows 11 Pro, you can follow these steps:

1. Ensure you have a valid product key: Make sure that the product key you purchased is for Windows 11 Pro.
2. Open Activation Settings: Go to Settings > Update & Security > Activation.
3. Enter your product key: If you see an option to enter a product key, click on it and input your Windows 11 Pro key.
4. Use Command Prompt (if necessary): If activation fails through the settings, you can try using the Command Prompt. Open Command Prompt as an administrator and enter the command: slmgr /ipk to install the product key, followed by slmgr /ato to activate it.
5. Check for errors: If activation fails, take note of any error codes that appear. You can look these up for specific troubleshooting steps.

If you continue to experience issues, ensure that your device is connected to the internet and that there are no restrictions preventing activation. Additionally, you may need to contact Microsoft support for further assistance if the problem persists.

References:

• Activate Windows
• Can't Activate Windows after MSFT Forced Upgrade to 11

What's the context here?

First time using the license, or is this a reinstall?

How did you obtain your license initially?

Did it come with the device preinstalled, or did you purchase it?

If you purchased it, did you purchase from Microsoft, or from third party?

Is it originally a Win7/8 key?

Just to make sure, is motherboard changed?

To activate Windows 11 Pro on a PC where it is already installed, a valid license is required, either as a digital license or a product key.

1. Check current activation status:
   • Select Start > Settings > System > Activation.
   • Under Windows, check whether Windows is activated.
2. If there is no license yet (not activated):
   • A Windows 11 Pro license can be obtained in one of these ways:
     • Buy a new device that includes Windows 11 Pro (product key is provided with the device or embedded).
     • Buy Windows 11 Pro (full license or upgrade) from the Microsoft Store app (digital license linked to a Microsoft account).
     • Buy a box copy or digital copy of Windows 11 Pro from an authorized retailer (product key is in the box or confirmation email).
   • If there is no key or license yet and Windows 11 Pro is already installed:
     1. Go to Start > Settings > System > Activation.
     2. Select Go to Store (or Open Store) to open the Microsoft Store app.
     3. Purchase a Windows 11 Pro digital license. Once the purchase completes and the PC is online and signed in with the same Microsoft account, activation should occur automatically.
3. If there is a product key for Windows 11 Pro:
   • Select Start > Settings > System > Activation.
   • Choose Change product key.
   • Enter the 25-character Windows 11 Pro product key from the device packaging, Certificate of Authenticity, card, or confirmation email.
   • Complete activation while connected to the internet.
4. If online activation fails:
   • Use the activation troubleshooter from Settings > System > Activation as described in Activate Windows.
   • If still not successful, activation can be done by phone using the Activate by Phone option in Settings > System > Activation, or via the Product Activation Portal using the information shown on that screen.

References:

• Activate Windows
• Product activation for Windows - online & Microsoft Support Product Activation Portal

Hi there, julian! Marc here.

Thanks for reaching out! If you already have a valid product key for Windows 11 Professional, activating it is straightforward. Here’s how you can do it:

> Open Settings: Press Windows key + I to open the Settings app.

> Go to Activation Settings Click on System > Activation Select “Change product key”

> Under Activation State, click “Change” next to Change product key

> Enter your 25-character Windows 11 Pro key. It looks like this: XXXXX-XXXXX-XXXXX-XXXXX-XXXXX

> Click Next, then Activate

> If you've entered the key and it's not working, make sure: You're connected to the internet. also the key is for Windows 11 Professional, not another edition (like Home or Enterprise)

> You can also run the Windows Activation Troubleshooter: Go to Settings > System > Activation. If you see Troubleshoot, click it and follow the prompts

If you still run into issues, feel free to reply with the error code or message you're seeing. I’ll be happy to help further!

Best regards,

Hello, Trinha.

Try to fix the problem via:

If the Windows Pro license is in order, then the Home edition should be updated to Professional and the OS will be activated. When changing the key, enter the unique Pro key that you received when purchasing the license. Write about the result.

Because the PC was bought with Windows 11 Pro preinstalled and only the hard drive was replaced, the license is most likely either:

1. An OEM key embedded in the device firmware (BIOS/UEFI), or
2. A digital license tied to a Microsoft account.

Use these options in order:

1. Let Windows auto-activate from firmware (OEM key)
   • Install Windows 11 Pro on the new drive.
   • Connect to the internet.
   • Go to Settings > System > Activation and check if it shows as activated.
     For many branded devices, the product key is stored in the BIOS/UEFI and Windows reads it automatically during installation, so no manual key entry is needed.
2. Check for a digital license / Microsoft account
   • If the PC was ever signed in with a Microsoft account, and the license was linked, activation may complete automatically once signed in with the same account.
   • Digital licenses are associated with the hardware and Microsoft account and do not require a visible product key.
3. Retrieve the OEM key from firmware (if Windows is running)
   If Windows is installed but not activated and the device is an OEM system (common with Amazon prebuilt PCs), the OEM key may be embedded in firmware. From an elevated Command Prompt, the OEM key can be read (as shown in the ROG example in the context) and then entered under Settings > System > Activation > Change product key.
4. Check purchase documentation
   • If the PC came with a separate Certificate of Authenticity (COA) label, card, or documentation in the box, the product key may be printed there.
   • If Windows 11 Pro was supplied as a separate digital license or upgrade, the key may be in the confirmation email or order details from the seller or from the Microsoft Store order history if purchased directly from Microsoft.
5. If no key or digital license can be found
   • For a new/refurbished device running Windows 11, activation normally uses a product key that is either preinstalled, on the packaging, or on a COA. If none of these are available and the firmware does not contain a key, contact the Amazon seller or device manufacturer and request the Windows 11 Pro key that should have been supplied with the PC.
   • If they cannot provide a valid key and the device cannot auto-activate, a new Windows 11 license can be purchased: go to Settings > System > Activation > Go to Store to buy a digital license.

If activation errors appear during these steps, use Settings > System > Activation > Troubleshoot and follow the guidance in the activation error help article referenced below.

References:

• Find your Windows product key
• Activate Windows
• Get help with Windows activation errors
• I cannot find my product key even though I purchased Windows - Microsoft Q&A
• How do I get my 2 year old ROG Zephyrus laptop Win 11 pro to stop showing "Activate Windows" - Microsoft Q&A