Upgrading Windows 10 Home to Pro with 0c803f7001 error

Please Note:
Unlike many of the articles on this site, this article is written for “IT people” and relates to technical subject matter.
Only follow the below info if suitable to your specific situation and you understand and accept all risk.

Occasionally, when upgrading Windows 10 Home to Windows 10 Pro using a legitimate key you’ll get the follow message:

If you’ve confirmed your key is correct, and legitimate and should work here’s a solution you should try to get around this bug:

1. Locate the Windows 10 Generic/Default license key online. These are Keys from Microsoft that allow you to install a specific version of Windows 10 without actually activating it. You’ll need the specific one for your version, if Home, Pro or Enterprise.
2. Disconnect your Internet.
3. Activate using the Generic/Default license key, this will fail bit this is expected.
4. Reconnect the internet.
5. Activate with the correct key.

We’ve observed this issue on Windows 10 1909 but it may be present on other versions too.