Hi,
Yes, VPN is not supported in Active/Active Failover Mode.
Active/Active failover is only available on units running in multiple context mode.
Unsupported Features
Multiple context mode does not support the following features:
?Dynamic routing protocols
Security contexts support only static routes. You cannot enable OSPF or RIP in multiple context mode.
?VPN
?Multicast
Please refer the below URLs for details:
http://www.cisco.com/en/US/customer/products/ps6120/products_configuration_guide_chapter09186a008063b31a.html#wp1096075
http://www.cisco.com/univercd/cc/td/doc/product/multisec/asa_sw/v_70/config/contexts.htm#wp1116132
I hope it helps.
Regards,
Arul