Splunk rest curl query fails to execute on the successive attempts with the session key authorization

Question

First attempt creates the splunk SID, but fails on the successive attempts to create search id. Same issue occurs while polling/consuming the search after SID creation on its successive attempts. Can anybody point out helping the missing part?

Curl query used :

curl -H 'Authorization:Splunk sessionkeyincluded' https://hostname:60659/services/search/jobs -d search="search sourcetype=\"xx:yy\" earliest=\"03/19/2018:07:00:00\" latest=\"03/19/2018:07:15:00\" | stats count"

<?xml version="1.0" encoding="UTF-8"?>
<response>
  <sid>1522168074.7125_E472E7F2-9BEF-4117-A49A-8281B171EF1E</sid>
</response>

successive attempts fails with authentication failure mentioning "call not properly authenticated"

<?xml version="1.0" encoding="UTF-8"?>
<response>
  <messages>
    <msg type="WARN">call not properly authenticated</msg>
  </messages>
</response>