Cannot activate Windows 10 with product key after downgrading from 11 due to system issues

Hance Gadi 0 Reputation points
2025-12-17T22:00:53.0633333+00:00

Downgraded from Windows 11 to 10, have a valid product key but it is not activating. Please help me activate windows as microsoft has no online agents or phone number to help resolve this issue. Again i have a valid product key this should not be so difficult to get it activated but it will say "we cannot activate" for no reason at all, please help.

Windows for home | Windows 10 | Accessibility
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  1. Jeronimo Fuerte 27,515 Reputation points Independent Advisor
    2025-12-17T22:37:27.2766667+00:00

    Sorry to hear that you have troubles with this situation, could you please share a screenshot of the error message that appears when you try to activate the software? Was this product key purchased from Microsoft?

    Couldyou run this in CMD as administrator, please, and share a screenshot:
    slmgr /dlv

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