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Buy an additional legal non expensive win11 pro OEM key from a reliable source and use it to activate windows on the SSD where it is not active using the change key functionality you mentioned.
0x803FA067 Activation Error on New SSD
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JMIII
0
Reputation points
Hi All,
Problem / Scenario I'm dealing with:
- Brand new prebuilt gaming PC, 1TB Gen4 SSD preinstalled with Windows 11 Pro, activated, no problems here.
- Bought a 4TB Gen5 SSD and installed Windows 11 Pro on it, and the 1TB SSD moved to the 2nd SSD slot.
- Windows on the 4TB won't activate, Troubleshooting just leads to unable to activate Windows, error code 0x803FA067.
- Can switch between booting into either SSD, with the 1TB having the activated Windows 11, and the 4TB with the inactivated Windows 11.
Solutions tried, none worked:
- I reinstalled Windows on the 4TB - I thought perhaps there was an issue with the activated product key being tied to my Microsoft account as I only did a local account at first on the 1TB SSD, then did Microsoft account for my 4TB SSD install (because for the 1TB SSD I just wanted to confirm the PC was running but didn't want to bother with doing a full set up - logins, installing applications, etc. - as it will be a spare drive)
- In the 1TB SSD, I've pulled the Product Key via Registry Edit (BackUpProductKeyDefault value). Then tried to enter that in the 4TB SSD via Change Product Key
Any ideas?
Thank you.
Windows for home | Windows 11 | Licensing and activation
Answer accepted by question author
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Alexandr S 105.7K Reputation points Independent Advisor2026-08-23T01:19:20.2433333+00:00 The 3V66T key is not a unique key, but the well-known VK7JG-NPHTM-C97JM-9MPGT-3V66T stub. To activate, use the key from the purchased license kit (it is unique).
I must disappoint you. The recommendation itself from an LMLR user is nothing more than misleading and incitement to piracy. The fact is that "OEM keys" are just stolen keys, not licenses sold by scammers.:
If you see a listing on an auction site, online classified ad, or other online page advertising product keys for sale, it’s a good indication that the keys are likely stolen or counterfeit.
If you were to purchase and use a stolen or counterfeit product key to activate Windows installed on your PC, the key may not work for activation, may already be in use on another PC, or it might be blocked from use later by Microsoft when the key is reported stolen...
https://www.microsoft.com/en-us/howtotell/shop
I would like to add that the OEM is sold separately from the PC only as a System assembler Package (a white envelope with a DVD and a certificate of authenticity with a key) and its cost is slightly lower than the cost of the standalone BOX version. For $9, this is definitely a stolen key, which Microsoft will subsequently block.
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JMIII 0 Reputation points
2026-08-23T00:41:42.49+00:00 Update: Got impatient, just bought a Windows 11 Pro key online for $9, it's activated and now I have a lifetime key.
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Alexandr S 105.7K Reputation points Independent Advisor
2026-08-22T13:41:22.5466667+00:00 Hello, JMIII.
The EULA explicitly prohibits the installation and use of multiple copies of the OS with the same license, so one of the copies of the OS should be deleted.:
2. Installation and Use Rights.
a. License. The software is licensed, not sold. Under this agreement, we grant you the right to install and run one instance of the software on your device (the licensed device)...
To clarify the information and solve the problem, post a screenshot of the command window here.:
slmgr.vbs /dlvNote. There is no classified information there.
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JMIII 0 Reputation points
2026-08-23T00:20:46.6433333+00:00 Screenshot 2026-08-22 195030.png
Hi Alexandr,
Thank you for your input. Attached is the screenshot. Note this is after I have physically uninstalled the 1TB SSD, thus only the 4TB SSD is connected and I had reinstalled Windows 11 Pro. Same result, only difference is when I clicked Troubleshoot > I changed hardware on this device recently > resulting in "Unable to activate", before the error code changed from 0xC004F213 to 0x803FA067, now it just stays as 0xC004F213.
Other things I had tried earlier before doing the above (the 1TB SSD was still physically installed for these):
- Cloned the 1TB SSD onto the 4TB SSD. Errored on boot saying device couldn't be found. Perhaps due to both SSDs being physically installed. Didn't want to remove the 1TB SSD yet at the time but may revisit this later.
- Reinstalled Windows on 4TB SSD and when prompted for Key I input the key I got from RegEdit on the activated Windows from 1TB SSD. Key was accepted but all it did was chose for me the Windows edition to install. Ultimately led to same issue.
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