APM - Cookie issue with a mobile app

Hi,

I have a weird issue with a mobile app when trying to connect to a VIP with an APM policy (a SAML global IdP). The app correctly connects the first time, then when reopening the app, it sends an old cookie, and APM answers with the error page "cannot find session".

I captured to traffic to put in evidence the cookies sent by the app :

I tried to clear all cookies on the HTTP request but APM still sends the error page as it seems the removal occurs after the VIP IdP has already answered. More, I cannot find anywhere in the logs the session specified in the APM logs.

when HTTP_REQUEST {
if {[HTTP::uri] equals "/myapp"} {
     Loop through each cookie by name
    foreach cookie [HTTP::cookie names] {
         Log the cookie name and value
        log local0. "Cookie name: $cookie, Cookie value: [HTTP::cookie value $cookie]"
        HTTP::cookie remove $cookie
    }

Is there anyway to tell APM to open a new connection and start the policy in this case ?

I am running 11.6 HF6.

Thanks, Pascal