Before you can use the Feedback app, you need to configure your tenant to allow the app to send emails.
Here is how to do that:
- Go to portal.azure.com and log in with administrative rights
- Click on the Active Directory
- On the left panel, select App Registrations
- Under All Applications category, find the app named “SharePoint Online Client Extensibility Web Application Principal” as shown below.
- Click on the app link From the left panel
- Select API Permission
- Select Microsoft Graph from the list of applications
- Add new Delegated permission “Mail.Send” as shown below
Finally, you will need to grant admin consent as follows:
- Click the [Grant admin consent … ] link as shown below
- Click Yes and confirm that permission has been granted.
Give it a few minutes for this change to propagate in your tenant