This error occurs when a client is attempting to install third-party software update(s) that are signed using a WSUS signing certificate that isn't trusted or the allow third-party updates policy isn't enabled the machine. The signing certificate needs to be in the Trusted Root and Trusted Publishers certificate store.
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Knowledge Base Articles / Re: Third-Party Updates Fail to Install with Error 0x800b0109 in SCCM
July 19, 2020, 11:40:29 AMPages1