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Warning

Microsoft's cloud services, including web versions of Teams, Outlook, and Microsoft 365 domains, are migrating to the *.cloud.microsoft domain. Perform the following steps as soon as possible to ensure your app continues to render on supported Microsoft 365 web client hosts:

  1. Update TeamsJS library to v.2.19.0 or later. You must call microsoftTeams.app.initialize() to avoid seeing a warning in the new domain. For more information about the latest release of TeamsJS, see Microsoft Teams JavaScript client library.

  2. If you've defined Content Security Policy (CSP) headers for your app, update the frame-ancestors directive to include the *.cloud.microsoft domain. To ensure backward compatibility during the migration, retain the existing frame-ancestors values in your CSP headers. This approach ensures that your app continues to work across both existing and future Microsoft 365 host applications and minimizes the need for subsequent changes.

Update the following domain in the frame-ancestors directive of your app's CSP headers:

https://*.cloud.microsoft