Issue: The offline activation operation "Start File Creation" failed due to "Error Retrieving Entitlement ID from mail body!"
Common failure reasons are:
The Entitlement ID of the license is not present in the email body.
The license has already been activated on another computer.
The license fulfill count exceeded the available seat count. If this is the case, there are no more activations available for the license.
Resolution: Please contact Hexagon Technical Support for further assistance.