How do I transfer my valid Windows product key into a digital license and link it to my Microsoft account?

[Windows 10]

The current situationI just did a clean install of Windows 10 on my PC after upgrading the motherboard, CPU, and RAM. During the setup process, I entered my 25-digit product key for my full retail license of Windows 10 Pro (which was a free upgrade from my Windows 7 Pro). This was accepted with no issue. Once I got into Windows, I went to Settings -> Activation. There were three sections here at that point: Windows, Update product key, and Add a Microsoft account. I clicked the "Add an account" button in this section and signed in to my Microsoft account. Unfortunately, for some reason this

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