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Outlook Web Add-in Sideloads Successfully but Does Not Appear in Apps Popup (SSO Add-in)

Funmi Sonaiya 0 Reputation points
2025-11-06T10:38:44.9866667+00:00

After following the official documentation for registering an SSO-enabled Outlook add-in (Register your Office Add-in that uses SSO with the Microsoft identity platform (v2)), sideloading now completes successfully — but the add-in does not appear in Outlook Web’s “Apps” popup or panel.

✅ What’s Working

  • Sideload completes successfully (no “Sideloading rejected by Exchange” error).
  • The add-in appears in the Manage add-ins list with “Added” status.
  • Manifest validates successfully with no schema or XML errors.

⚠️ Current Issue

The add-in does not appear in the Outlook Web “Apps” popup/panel, where other add-ins such as Viva Insights or Send to OneNote are listed.

Even though it shows as installed, it’s not visible when:

  • Opening emails in read mode
  • Composing new emails
  • Viewing the calendar

🔍 What’s Been Tried

  • Clearing browser cache and restarting Outlook Web
  • Signing out and back in
  • Waiting over 15 minutes for potential propagation

🧩 Configuration Details

  • Using MessageReadCommandSurface extension point in the manifest
  • All resource URLs (commands.html, taskpane.html, icons) are accessible via HTTPS
  • Azure AD app includes a custom access_as_user scope
  • All API permissions granted with admin consent

❓Questions

Are there any Exchange Online settings or policies that could prevent SSO-enabled add-ins from appearing in the Outlook UI, even after successful sideload?

Could there be a delay or propagation period before an SSO add-in becomes visible in the UI?

Are there any manifest or Azure AD configuration requirements that could affect the add-in’s command visibility?

Any insights or diagnostic steps to help identify why the add-in isn’t showing up would be greatly appreciated.

Outlook | Web | Outlook on the web for business | Settings
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  1. Ryan-N 8,555 Reputation points Microsoft External Staff Moderator
    2025-11-06T18:01:30.4466667+00:00

    Hi @Funmi Sonaiya,

    Welcome to the Microsoft Q&A forum.

    Thank you for reaching out to us. Based on the information you provided, we would like to share the following guidance:

    After reviewing, we found that your settings appear to be quite complete.

    • The issue might originate from the manifest or the version override structure.

    In this case, we recommend that you raise a support ticket to Microsoft Technical Support by following these steps:

    Step 1: Go to https://admin.microsoft.com

    Step 2: Click Get help & support

    User's image

    Step 3: Enter the subject line:

    Need diagnostic support to identify why the add-in is not displaying

    User's image

    Step 4: Click the blue arrow > Contact support

    Step 5: Choose your preferred contact method

    User's image

    Once you complete these steps, a live agent will proactively reach out to you, assist with remote monitoring of your settings and configurations, and guide you step-by-step until the issue is fully resolved.

    Note: We appreciate your understanding regarding the scope of support available through this forum. Our role as moderators is to provide general guidance and assist with common troubleshooting steps. We do not have access to internal systems or administrative tools required to resolve account-specific or backend-related issues. However, we will continue to do our best to support you within the scope of our responsibilities.

     If you have any updates regarding the issue or encounter difficulties in contacting Microsoft Support, please feel free to share them with me. I will assist you.

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