Based on the configuration on your last post, you have:
A virtual server receving traffic on port 8443
A client ssl profile to encrypt traffic towards the clients
No server ssl profile to consume encryption from the backend platform on the pool
Is the platform on backend pool members encypted? If so, you'll need to add a server ssl profile to the virtual server.
In terms of the client ssl profile, you need to configure the specific ssl certificate with it's private key and Chain certificate (Issuer intermediate certificate with which the primary certificate was signed with).
Hope that helps.