This document describes how a Planner customer can migrate their Outlook add-in to use the new Nested App authentication, providing better security and greater flexibility (https://learn.microsoft.com/en-gb/office/dev/add-ins/outlook/faq-nested-app-auth-outlook-legacy-tokens)

This removes the use of legacy Exchange Online tokens from the Planner Outlook add-in.

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1. In Planner, navigate to Administration » Integrations » Outlook add-in
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2. Press Re-grant admin consent and follow the admin consent flow
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3. Under Manifest, press Download manifest to download the updated Outlook add-in manifest
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a. Make sure that you don’t press Download deprecated manifest

4. Go to the Microsoft 365 admin center, and find the Integrated apps page: https://admin.microsoft.com/Adminportal/Home?source=applauncher#/Settings/IntegratedApps

5. Click on the Planner entry, and in the details window that opens, press Update add-in and proceed to upload the new manifest that you just downloaded from Planner.

6. The updated Outlook add-in manifest will now be deployed automatically, and will use nested app authentication. You can verify that you are running the new add-in, by opening the add-in from Outlook Web, and checking the web console log for an entry saying Acquired token silently.

Two options are available to enable support for Safari browsers, both documented by Microsoft below:

1. Known issue on Safari

2. Configure macOS Enterprise SSO app extension with MDMs
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The following option is available to enable support for the Outlook application running on Apple Mac machines, documented by Microsoft below:

1. Configure macOS Enterprise SSO app extension with MDMs

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