VPN--SSO not working for on mobile devices if SSL offloading is enabled on VIP

We have F5 4000 appliance , configured with two partitions and route domain.One is used for VPN and another for Load balancing.

 

Configuration

 

Load Balancer - We are doing load balancing for one WEB APP-1 and VIP is configured.

 

VPN - SSO is configured for APP-1 with one layered VIP.

 

Issue

 

If we are not doing SSL offloading on load balancer, SSO for APP-1 works fine through VPN on mobile , laptops. But if we enable SSL offloading on load balancer SSO does not work on mobile device (It works on laptops).

 

Query

 

How SSO can be achieve on mobile devices for APP-1 through VPN if SSL offloading is enabled on loadbalancer ?