Windows 10 Pro - can't re-activate after motherboard change

[Microsoft Windows]

Starting point - Desktop PC running Windows 10 Pro retail licence named, let's say, (not really) "MyPC". Not Windows 11 compatible. 16MB memory - this detail is useful later. Activation status before upgrade - "Windows is activated with a digital licence linked to your Microsoft account"I installed a new motherboard (and increased to 32MB memory) and Windows now says it is not activated.I went through the activation troubleshooter, and selected the option for 'I have recently changed hardware on this device.' It now shows me just one device on my account - from the name it is an old SURFACE de

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