Hi,
When copying configuration from one appliance to another please ensure they are on the exact same Async OS version and the configuration file is exported from the original appliance with passwords unmasked.
Please review the below article:
How do you load the configuration on a replacement ESA / Can you migrate a configuration from one ESA to another?
http://www.cisco.com/c/en/us/support/docs/security/email-security-appliance/117803-configure-esa-00.html
Thank You!
Libin Varghese