Deploy the Rainbow Outlook Add-in via XML Manifest (Admin)

This article explains how to deploy the Rainbow Outlook Add-in from Microsoft 365 Admin Center using the XML manifest.

Prerequisites:

• You have a Microsoft 365 admin role allowed to deploy add-ins (for example: Global Administrator or Exchange Administrator).
• You can access Integrated apps in Microsoft 365 Admin Center.
• You have the Rainbow manifest file: manifest-outlook-addin-prod-1.0.0.xml.

Deploy the Application from Office 365

1. Sign in to Microsoft 365 Admin Center with an admin account.
2. Open Settings > Integrated apps (or use this direct URL).
3. Click Upload custom apps, then in Deploy New App set App type to Office Add-in.
4. Keep Upload manifest file (.xml) from device, click Choose File, select manifest-outlook-addin-prod-1.0.0.xml, and wait for Manifest file validated.
5. Click Next, choose assignment scope (pilot recommended; this walkthrough uses Entire organization), then click Next.
6. On Accept permissions requests, click Accept permissions, then confirm in the Microsoft pop-up with Accept until Permissions accepted appears.
7. Click Next, review, then Finish. Wait for Deployment completed, then verify availability in Outlook Web and Outlook Desktop.

Note: It can take up to 72 hours for the app to appear. Users may need to relaunch Microsoft 365 to view the add-in icon on the app ribbon.