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In your browser, go to the Microsoft 365 Admin Center at https://admin.cloud.microsoft.
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Log in as either Global Admin, Exchange Admin or Microsoft 365 Apps Admin.
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In the left menu navigate to Settings → Integrated apps.
- Click Upload custom apps.
- Under App type select Office Add-in, and upload the manifest file for your Outlook add-in. After it has been validated continue by clicking Next.
- Under Add users, select one of the options to who you want to assign users to the Outlook add-in; Just me, Entire organization or Specific users or groups. Click Next when you have made your choice.
Note: In below example we have prepared a group called Humly Visitor, which contains users which will have access to the add-in.
- Under Accept permissions requests, review app permissions and capabilities and click Accept permissions to continue.
- You will be redirected to a new page on the same browser where you will be asked to pick an account you want to accept the permissions using. Click the account.
- Review the permissions requested and click Accept to confirm.
- You will be redirected, and you will see that the permissions has been accepted for the add-in. Click Next to continue.
- Finally, review and finish deployment by clicking Finish deployment.
- Deployment is now completed. It can take up to 72 hours for the add-in to appear, and users may need to relaunch or log in again to be able to see the add-in on the app ribbon in Outlook calendar view when creating an event.
- The add-in will also be visible under Settings → Integrated apps → Deployed apps.
