Windows defender error 0x80240016 cannot upload definitions

I am also not able to update Windows.

Question Info

Last updated July 23, 2018 Views 3,861 Applies to:


This issue occurs if a Windows Update client or a Microsoft Update client cannot access the user token.

Refer this KB article and follow the steps:

Error message when you try to install updates from the Windows Update Web site or from the Microsoft Update Web site: "0x80240016"

Also refer this article:

How to troubleshoot definition update issues for Windows Defender:

Afzal Taher-Microsoft Support.
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