I recently undertook a fairly significant hardware change on my desktop (New motherboard and CPU), and reinstalled Windows 10 Home via the media creation tool without wiping the SSD it was on, thus sending files related to the previous installation into a Windows.old folder (Which I have already gotten rid of through disk cleanup).
However, I am now unable to activate my current install of Windows. Going through the troubleshooting in the activation tab just tells me that there is no device on my account that can be used to activate my current install (even though it is listed in my account). Everywhere I look is a dead-end (even the web activation portal just states that my request is blocked after the captcha, which I do pass), so I'm not sure how to proceed.
I have gone through this process about 1 1/2 years ago, and never had to actually deactivate my previous install--I just did the troubleshooting and selected that I had changed my hardware, and was able to get it done (Yes, I did link my license to my account, which is the same account that I'm using rn). Although, the biggest difference is that I DID wipe my SSD to reformat it. Maybe having that installation wiped completely effectively deactivated the key, thus allowing it to be used on my new install?
I can't seem to locate anywhere to remotely deactivate my previous install, so I have no clue. Although, it's probably worth mentioning that the license was purchased, like, 6 years ago under my Dad's account (My account was a child account, though it had already been an adult account for some time when I linked the license to my account, which did work afaik).
From what I've seen, removing the previous install from my account's connected devices will not deactivate the license on it, even if said license is linked to my account, so that doesn't help (unless the info I've gotten was wrong).
If it comes down to it, I could try to wipe my OS SSD and reinstall cleanly, even if it'd be annoying.