An unknown error occurred while receiving email through the mailbox "UnknownIncomingEmailIntegrationError -2147209462 exception"

 "UnknownIncomingEmailIntegrationError -2147209462 exception"

Dynamics 365 Customer Engagement Online

Symptom

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The following alert is logged within the mailbox record for a Dynamics 365 mailbox:

"An unknown error occurred while receiving email through the mailbox "Your mailbox is now connected to Dynamics 365". The owner of the associated email server profile [Mailbox Name] has been notified. The system will try to receive email again later.

Email Server Error Code: Exchange server returned UnknownIncomingEmailIntegrationError -2147209462 exception."

Cause

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This error is logged if the corresponding Queue record in Dynamics 365 is owned by a team that does not have any security roles assigned. 

Resolution

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1. Within the mailbox record in Dynamics 365, click the value in the Regarding lookup to open the corresponding Queue record. 
2. Verify the Owner of this Queue record has a security role assigned.
3. You can do this by clicking on the value in the Owner field to open the owner record.
4. Click the Manage Roles button and assign a security role with sufficient access.