MS TEAMS DesktopApp macOS - SSO of MS Teams plugin (custom app) does not work

Hi Jaquinei , 

When using the Microsoft Teams Desktop app on macOS, there are a few considerations and configurations you can check to ensure that Single Sign-On (SSO) works for your custom app or plugin. Here are some suggestions:

1. Verify App Permissions: Make sure that the necessary permissions are configured for your custom app within the Microsoft Teams admin center. Check if the app has the appropriate permissions for SSO and accessing the required resources.

2. Configure Teams App Manifest: Ensure that your app manifest includes the necessary configuration for SSO. Specifically, check that you have correctly set up the "singleSignOnSettings" property with the required parameters, such as the "ssoAppId" and "aadAppId".

3. Verify macOS Keychain Access: Microsoft Teams relies on the macOS Keychain for SSO operations. Ensure that your custom app or plugin is granted access to the Keychain. You can verify this by going to the "Keychain Access" utility in macOS and checking if your app or plugin is listed with the appropriate permissions.

4. Review App Configuration: Double-check the configuration settings within your custom app or plugin. Ensure that the necessary SSO-related parameters are correctly set up, such as the Kerberos authentication settings and the authentication endpoint URL.

5. Test in Different Environments: Test your app or plugin in various environments, including different macOS versions, Microsoft Teams versions, and different user accounts. This can help identify if the issue is specific to a particular setup or configuration.

6. Consult Microsoft Support: If you have followed these steps and are still experiencing issues with SSO in the Microsoft Teams Desktop app on macOS, it is recommended to reach out to Microsoft Support for further assistance. They can provide specific guidance and investigate any potential issues with the Teams app or your custom app.

Remember to keep your custom app and the Microsoft Teams Desktop app up to date to ensure compatibility with the latest features and improvements.