A retrieval request fails with the following error:
event id: 3176 - A RetrieveMarkedItems request has failed
Error: Client refused due to insufficient privileges, user attempted to access the Vault: Vault Name: Vault Id: but did not have access (0xc0040aad)

This can occur under the following condition:
- User logs into workstation using the account - (example: Company\User1)
- User launches Outlook Web Access (OWA) using the credentials for a secondary mailbox (shared@Company.com)
Note: This occurs when the browser is set to:

Note: With either setting applied, the browser automatically passes the account credentials of the user logged into the workstation. (example: Company\User1)
There are two methods to address this issue:
1.) Apply full access (mailbox delegation) rights to the secondary mailbox (shared mailbox) to the logged on windows account. (example: Company\User1)
Note: Enterprise Vault will synchronize the mailbox permissions and apply the permissions to the secondary mailbox's (shared mailbox) Archive.
2.) Change the browser setting to prompt for username and password
Note: This will allow the end user to re-apply the credentials of the secondary mailbox (shared mailbox) when prompted.