New article about errors when office add-ins start

Author: Cloud-Writer

Office/Client/office-suite-issues/errors-when-office-add-ins-start

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+---
+title: Errors when Office add-ins start
+description: Provides information about errors that might occur when Office add-ins start.
+author: Cloud-Writer
+ms.author: meerak
+manager: dcscontentpm
+audience: ITPro
+ms.topic: troubleshooting
+ms.reviewer: rickki
+ms.custom: 
+  - sap:Microsoft 365 Apps for enterprise\Add-Ins\Add-Ins from AppSource/Sideloading/Network Share/EXO Admin/SharePoint Catalog
+  - CSSTroubleshoot
+  - CI 7885
+search.appverid: 
+  - MET150
+appliesto: 
+  - Microsoft 365 Apps
+ms.date: 12/13/2025
+---
+
+# Errors when Office add-ins start
+
+## Symptoms
+When Microsoft Office tries to start an Office add-in that uses a task pane, an error occurs, and the add-in doesn't start. In this situation, Office displays an error message in an information bar at the top of the task pane, as shown in the following screenshot.
+
+:::image type="content" source="media/errors-when-office-add-ins-start/office-add-in-information-bar.png" alt-text="Screenshot of the information bar displayed at the top of the task pane.":::
+
+> [!IMPORTANT]
+> This kind of error is generated by Office, not by the add-in. Unless the error message explicitly states otherwise, users should *not* contact the add-in provider. They should contact their Microsoft 365 administrator, instead.
+
+The following table lists the most common error messages that cause users to mistakenly contact the add-in provider.
+
+| Error text  |  Explanation |
+|---|---|
+|This Add-in uses features not supported by its add-in catalog.|For more information about this error, see [Deploy and publish Office Add-ins](/office/dev/add-ins/publish/publish#additional-publication-methods-for-the-add-in-only-manifest).|
+
+