I had an MS rep argue with me for 25 minutes before I found the FAQ section. These MS reps are so ignorant of their own policies! (Shawn 'Cmdr' Keene explains it pretty good) Microsoft saves your mainboard-id/hash/installation-id on some servers where we do not have any access to it. That has nothing to do with the windows 10 key and deleting any old computers will not change anything. I am not sure about that, but the MS-account probably only shows your PC and it's hostname. "I just checked out my Microsoft account and realized that both motherboards are registered to the same key/build":
You need a full retail version of windows 7 pro. Though if you only have an OEM-version of windows 7, this will probably not work.
Only then you can clean install windows 10 if you like to.
Then let it upgrade to windows 10 and again make sure, that it is activated. In order to get your windows 10 activated you should first reinstall windows 8 on the new machine (new mainboard) and make sure that it is properly activated. "Today I built a new computer and used the hard drive from my old one, the one with Win10 on it":
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So the workaround is to uninstall the optional preview update KB5001692 (and later updates), hoping that the activation will then work.Microsoft Community Chat Helpful resources Microsoft writes that the error does not occur if the security update from Januor an earlier update is installed. Microsoft's Workaround: Uninstall the Updates A resulting "Access Denied" error causes the product key to fail to extract correctly. The cause of the 0xC004C003 error is an attempt by a licensing code component to access a registry structure that does not have proper access. This issue can occur when users attempt to activate the operating system with a digital product key (DPK) for OEM Activation 3.0 (OA3). If you think you do have a valid license or key, select Troubleshoot below. We can't activate Windows on this device because you don't have a valid digital license or product key. In this particular case, the error text from the following screenshot is displayed: Microsoft has published the support article KB5001692: Windows Activation fails with error 0xc004c003 on devices which have installed the Windows 10 January 2021 nonsecurity preview release or a later version. This affects the following Windows 10 versions: Users who have installed update KB5001692 (3rd week of January 2021 preview update) may also run into activation error 0xc004c003. Activation error 0xc004c003 caused by update KB5001692 But there is a special case, caused by an update, as I've learned. In the case of activation error 0xc004c003, activation by phone is recommended. Windows 10 users may face multiple activation errors.