SharePoint Subscription Edition: error when clicking a DocID field (bug introduced in the August 2026 CU)

You may see this error in the ULS log, or a similar one in the web UI:

Microsoft.Office.DocumentManagement.InvalidDocumentIdProviderException: Invalid document ID provider: Microsoft.Office.DocumentManagement, Version=15.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c, Microsoft.Office.DocumentManagement.Internal.OobProvider
at Microsoft.Office.DocumentManagement.DocumentId.GetProvider(Hashtable rootWebProperties)
at Microsoft.Office.DocumentManagement.Pages.DocIdSettings.UpdateControlStates()
at Microsoft.Office.DocumentManagement.Pages.DocIdSettings.OnLoad(EventArgs e)
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

…or with Version=14.0.0.0.

You most likely see this on a migrated site collection.

I fixed it with the following script:

Get-SPSite -limit all | ForEach-Object {
    $site = $_

    if( $site.ReadLocked -or $site.IsReadLocked -or $site.WriteLocked -or $site.ReadOnly ) {
        write-host "Site $($site.Url) is locked. Skip."
    } else {
        $rootWeb = $site.RootWeb
        if( $rootWeb.AllProperties["docid_customProvider_assembly"] ) {
            if( $rootWeb.AllProperties["docid_customProvider_assembly"] -like "Microsoft.Office.DocumentManagement*" -and
                    $rootWeb.AllProperties["docid_customProvider_assembly"] -notlike "*Version=16*" ) {
                    $rootWeb.AllProperties["docid_customProvider_assembly"] = "Microsoft.Office.DocumentManagement, Version=16.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c"
                    $rootWeb.AllProperties["docid_customProvider_class"] = "Microsoft.Office.DocumentManagement.Internal.OobProvider"
                    $rootWeb.Update()
                    write-host "Site $($site.Url) patched."
                } else {
                    write-host "Site $($site.Url) is already fine."
                }
        } else {
            write-host "Site $($site.Url) has no DocID provider registered."
        }
    }
}

Reference:

• August 2026 CU for SharePoint Server Subscription Edition (blog.stefan-gossner.com)