Set up the service account

1. Log on to the Exchange Admin through the Office365 portal.
2. In the Exchange admin center, click permissions.
3. Click to create a new role group.
4. Enter a descriptive name in the popup window.
5. Add a role and choose ApplicationImpersonation.
6. Add the member user you want allow these permissions to.

Use these settings to enter in the manage-sources-email section of Indica. Read more in this document.