Capturing Diagnostic request 27 01 / Seed using DiagGetParameterRaw on Capl/Canoe

Question

I want to capture response of this request 27 01 but unfortunately I am getting 00 00... I can see the request and the response on trace with positive response , thus I can see the seed on trace as well.

diagRequest ECU.SeedLevel1_Request req;
diagResponse ECU.SeedLevel1_Request resp;
//here code to enter extended session
..
..
..
// Send req to request seed 
DiagSendRequest(req);
DiagGetLastResponse(req,resp);
DiagGetParameterRaw(req, "Seed", gSeedArray, elcount(gSeedArray));
for(i=0;i<32;i++)
{
   write("%x",gSeedArray[i]);
}
gSeedArray always reports 00 ..

I tried for other requests for example reading dids and they works I captured the response and it s stored , it doesn't work only for this security service.