How to fix O365 Sync error on SCCM. The remote server returned an error: (400) Bad Request

Nemani Rajesh Babu 0 Reputation points
2026-05-14T06:08:01.82+00:00

Getting below error during the sync process - Please help with workaround or solution

ProcessFileManifest() failed to process O365 file manifest. Caught exception: System.Net.WebException: The remote server returned an error: (400) Bad Request.~~   at System.Net.WebClient.DownloadDataInternal(Uri address, WebRequest& request)~~   at System.Net.WebClient.DownloadString(Uri address)~~   at Microsoft.SystemsManagementServer.SoftwareUpdatesManagement.WsusSyncAction.WSyncAction.ProcessFileManifest_O365Service(String sO365ServiceUrl, XmlWriter xml, String updateId)

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  1. AI answer

    2026-05-14T06:08:23.51+00:00

    The 400 Bad Request error when SCCM (Configuration Manager) synchronizes Microsoft 365 Apps (O365) updates is typically caused by a known issue with specific Office 365 client updates published to the Microsoft Update Catalog.

    For similar issues, Microsoft documents the following points:

    1. Certain Office 365 client updates that were released on December 10, 2019 caused download/sync failures in Configuration Manager. These updates were temporarily removed and then republished to the Microsoft Update Catalog after the issue was fixed.
    2. When this catalog-side issue occurs, Configuration Manager cannot correctly download or process the Office 365 update metadata or content, which leads to errors during sync or download.

    Recommended actions based on the documented behavior:

    1. Confirm whether the failing updates correspond to a known problematic release (for example, a specific Office 365 client build that has been withdrawn or republished).
    2. Force a software update point sync after Microsoft republishes the affected Office 365 client updates. Once the catalog entries are corrected, the sync and subsequent downloads should succeed without additional local changes.
    3. If the problem persists only for a small set of Office 365 updates, temporarily decline or exclude those specific updates from deployment until updated versions appear in the catalog, then resync and test again.

    If the environment is on Configuration Manager current branch 1910 or 2002 and the failures occur when downloading Office 365 updates (with errors such as authentication failures or catalog validation errors), also verify whether any recent Windows updates introduced issues with Office update downloads, and apply any documented fixes or workarounds from Microsoft for those versions.

    References:

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