Manifest File Validation Has Failed Error When Installing Outlook Add-in

Created by Khaled Atmaz Alsibai, Modified on Mon, 9 Feb at 11:02 PM by Alsabana Sahubarali

Symptom

Admins see the following error message when installing the Outlook Add-in.

 

Screenshot_2023-02-17_at_1.48.09_PM.png

Applies To

  • Outlook Add-in Installation
  • Outreach Installation
  • Admins

Resolution

This is a known issue that Microsoft is handling. Further details are logged here. This article will be updated when the issue is resolved.

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