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Event ID: 204 Source: Microsoft-Windows-Bits-Client

The BITS service provided job credentials in response to the UNIDENTIFIED authentication challenge from the server for the Microsoft Outlook Offline Address Book transfer job that is associated with the following URL: /OAB/85626b71-dcd3-4983-98c4-d1d41059795c/oab.xml.
The credentials for the S-1-5-21-553833494-3868042766-1590673301-1142 user were rejected.
TD408487 contains information on how to enter the correct credentials for the BITS job.
VPN is used to connect to a network and from there to a WSUS Server you might experience errors downloading some updates.

Windowsupdate.log shows:

DnldMgr Error 0x80200053 occurred while downloading update notifying dependent calls.
DnldMgr WARNING: Avoiding resume due to BG_E_VALIDATION_FAILED.

See ME734664 and the BITS Return Values links.

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