The User credential provided in the 'Organization Settings' page or while configuring 'Exchange Reporter Plus Service' is not a member of the desired privileged group.
Verify if the user provided in the 'Organization Settings' page is a member of one of the following Groups
The user credential should also have "Send As" and "Receive As" permissions on Organization Mailboxes. When the Product is installed as a Service, the configured Service Account must also be a local system administrator account.
Fill this form, and we'll contact you rightaway.
Our technical support team will get in touch with you at the earliest."