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Small and medium business | Business Central, N...
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Outlook Add-in download fails in Assisted Setup – DotNet variable not instantiated (Codeunit 1652)

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Hi everyone,

I’m facing an issue while configuring the Outlook add-in in Business Central using Assisted Setup.

When I click Download add-in, Business Central throws the following error:

A DotNet variable has not been instantiated. Attempting to call
System.Xml.XmlNode.OwnerDocument
Codeunit: Add-in Manifest Management (1652)
Method: GetManifestNamespaceManager

 

AL Call Stack (excerpt):

  • Add-in Manifest Management (1652).GetManifestNamespaceManager

  • Add-in Manifest Management (1652).SetNodeValue

  • Add-in Manifest Management (1652).GenerateManifest

  • Outlook Individual Deployment (Page 1832).DownloadManifests

Environment details:

  • Business Central version: 27.3.44313.44463

  • Deployment: Cloud

  • No custom extensions related to Outlook add-in

  • Issue occurs consistently when downloading the add-in

From the stack trace, it appears that the XML manifest node is null, causing the Base Application code to fail during manifest generation.

Questions

  • Has anyone encountered this issue in BC v27.x?

  • Is this a known bug fixed in a later cumulative update?


     
Screenshot 2026-01-23 130928.png
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