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When connecting to more than 20 profiles an Impersonation Role will be required. It is advised to use an Impersonation Role when connecting to less than 20 profiles, however, it is not a strict requirement.

What is an Impersonation Role?

As described by Microsoft.

“… Impersonation enables a caller to impersonate a given user account. This enables the caller to perform operations by using the permissions that are associated with the impersonated account, instead of the permissions that are associated with the caller’s account.”

Setting up an Impersonation Role

This guide covers how to set up Impersonation Roles in Office 365, the process may vary in Exchange.

This process requires Admin rights.

1. Navigate to Admin Portal in Office 365:

   

2. From the left side menu scroll to the bottom and find Exchange:

   

3. From the Exchange admin centre navigate to permissions on the left:

   

4. Select the PLUS icon to add a new admin role, a new window is displayed:
   

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5. Complete the Name and Description fields, these can be set to any value.

6. Select 'ResourceMailboxes' under Write scope if not set by default.

7. Under Roles select the PLUS icon and choose 'ApplicationImpersonation'.

8. Under Members select the PLUS icon and choose the ResourceXpress admin account.

9. Click Save.