Windows 10: How do I activate my Win 10 Pro subscription on a new PC with my existing Microsoft account?

Hello! I had purchased a Windows 10 Pro product key a while back. Due to a technical issue, I had to switch PCs. In my new PC, with the same Microsoft account as earlier, I am unable to get my Win 10 Pro activation. The PC had come with a pre-built Win 10/11 Home edition. But I would like to switch to Pro. Please let me know what I can do to switch.

:)

 

How to activate existing Win 10 Pro and MS Office on a new PC

Dear Microsoft Community

I have just upgraded to a Rizen 1600 PC

I want to deregister my existing Win 10 Pro and MS Office Pro and activate it on my new PC.

1. The old PC is no longer in use

2. The old PC's SSD drive, where Win 10 and Office were installed is now on the new PC

3. I bought and paid for my Win 10 and Office and have the original licence details

4. The current PC has Win 10 Home basic installed.

How do I activate Win 10 Pro and MS Office Pro on the new PC?

Thank you

 

Microsoft account does not exist error - but it does exist...

Another example of my confusion:

Step 1: Windows/Start button is pressed in the bottom left.

Step 2: Above "Power", "Settings", "Pictures" and "Documents" is my account/email address that I'm currently using to post this question with (which also is the Microsoft account I have my 365 subscription tied to). I click on my account with my personalized icon.

Step 3: Above "Sign out" and "Lock" is "Change account settings" which I click.

Step 4: I'm brought to "Your info" which has my personalized icon, correct email address, listed as the administrator too. I select "Manage my Microsoft account" and am taken to account.microsoft.com and logged in to the same correct email/account. I can see on this page my 365 family subscription is still active and fine.

Step 5: I go back to the "Your info" pop up settings window and below "Manage my Microsoft account" is another link to "Verify", of which I click.

Step 6: The small Microsoft Sign in window appears with prepopulated text saying that the same exact email address that I'm signed in on my computer using, (of which has active 365 subscription and has no issues seen on account.microosft.com when I log in) doesn't exist. The exact text is as follows and red: "That Microsoft account doesn't exist. Enter a different account or get a new one."

Step 7: When trying to re-enter the same email address, and clicking "Next" in the bottom right of the window, the red text persists that the account doesn't exist.

I can't comprehend how my correct email address which has Microsoft subscriptions simply can't be found or 'doesn't exist'.

Apologies for the long-winded questions, but I'm trying to be as thorough as possible so that anyone can review this and hopefully have a better understanding of the issues I'm having. I'm getting a bit desperate to have this sorted out and any solutions would be extremely valuable to me.

 

Getting new motherboard, have Win 10 Pro, would like to keep install

That is what I will try and do right now. Any suggestions on that? I am going through the How to Link Microsoft Account to Digital License for Windows 10 Activation tutorial to see if that will do it. Edit: So I am under: OPTION TWO Link Microsoft Account to Digital License and Switch Local Account to Microsoft Account Link Microsoft Account to Windows 10 Digital License At step 2, this is what it looks like:

So I can't get to step 3. How do I add a password login during start up. Any suggestions?