how to perform 2 way SSL authentication using Mobile client

To perform 2 way SSL auth, I am trying to connect server via F5 Big-IP from an Android Native Client, F5 returns BIG-IP error with certificate exception. Android Mobile client has server/client bks certificates in their truststore. BIG IP return logout error with certificate rejections. Note: from the Regular Mobile Browser Server is accessible via F5(BIG-IP)

Let me know if there is any setting error at F5 level

Thanks