Windows 11 Can't activate Windows 11 Pro after mainboard replacemt

M

MikeHxx

y PC came with an OEM (I guess) Windows Key two years ago. Recently, the supplier changed my motherboard as it was defective. It is the same mainboard but a different SN.Now, I can't activate Windows anymore. When I try Troubleshoot in System -> Activation the blue window opens but it says that my copy of Windows cannot be activated. That small button which says 'hardware change' etc. doesn't even appear. (see screenshot below)Any other online troubleshooting didn't help either. In my Microsoft account I see now two computers as devices with the same name. MS now thinks that I have Windows

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