In environments with Microsoft Exchange 2013, when attempting to change the Linked Master Account value in the Master Accounts tab in the Active Roles Console, the operation fails with the following error:
Failed to modify the object.
Administrative Policy returned an error.
Exchange Server-related operation failed.
Error on proxy command "Set-Mailbox". Cannot process argument transformation on parameter 'LinkedCredential'. Cannot convert the "System.Management.Automation.PSCredential" value of type "System.String" to type "System.Management.Automation.PSCredential"
Upgrade to Active Roles 7.1
This version of Active Roles provides a workaround for this issue through this a registry enabled fix which calls the "Set-User" cmdlet when the existing "Set-Mailbox" cmdlet fails.
One Identity has confirmed that this issue persists in Microsoft Exchange 2013 CU14.