My PC is running Windows 10 Pro, which was acquired via a free upgrade from Windows 7 Pro. I don't recall whether that version was OEM or Retail, as I got it something like 11 years ago through my university at the time. It involved going on to a microsoft
store, adding a product to a basket and checking out, but it was with an account registered to my uni email. I do not have the original product key or access to the student email account. This version has been activated with no problems for a while.
I recently upgraded my PC, swapping out the motherboard, among other things. As per https://support.microsoft.com/en-us/windows/reactivating-windows-10-after-a-hardware-change-2c0e962a-f04c-145b-6ead-fb3fc72b6665, I replaced my local user account with a
microsoft account before installing the new hardware. Now, having switched over, my windows is not activated and will not activate. I have tried the Troubleshoot, which says it "Can't activate my copy of windows" and suggests I speak to my system administrator.
I contacted support by requesting a phone call. The first agent went through various steps including remote access of my computer and trying to sort it herself, but was unable to help. At one point she told me that upon change of hardware, the windows 10
license would revert back to a windows 7 one?
I was transferred to a second agent, who told me that the license transfer would not work if it was an OEM Windows 7 key, and also repeatedly told me that "thousands of people" call with my story and unless I could provide proof of purchase or the original
W7 product key, he would not help, and my only option was to buy another copy.
The support page doesn't suggest that you can only transfer some sorts of license on a change of hardware. I had a fully activated copy of Windows 10, which I understood to be a license rather than a key. The support staff I spoke to contradicted each other
and on occasion themselves, and the second agent repeatedly talked over me and all but accused me of lying, which I wasn't impressed by.
Is there any way I can resolve this? I have considered changing back to the old motherboard to see if that would re-activate, but if it didn't carry over the first time I'm not sure if anything would be different now. The first agent suggested that I may
have failed to verify the microsoft account. I am fairly sure I did, and I have a verification code in an email from the day I changed the account type.
Is there anything I can do other buy an entirely new copy?