Windows License Will Not Transfer to New Motherboard

You replaced the motherboard, reinstalled Windows 11 Pro, and the Activation troubleshooter cannot find the linked device. A motherboard change creates a new hardware identity, so linking a digital license to a Microsoft account helps reactivation but does not make every license transferable. Verify that the new installation is Windows 11 Pro and that you are an administrator signed in with the same Microsoft account. Open Settings, System, Activation, Troubleshoot, choose “I changed hardware on this device recently,” and select the old device if it appears. If it remains absent, confirm how Windows was purchased. A transferable retail license can normally move after removal from the old device; an OEM license supplied with a computer is generally tied to that device. Do not publish the key or installation ID. Keep the purchase receipt and contact Microsoft activation support, because only they can validate and reassociate an eligible entitlement.