Not able to correlate RPOPENTOKEN returned after ACS.SAML2 custom request for auth returns response

I have a request that is going to ACS.SAML for authentication which returns in response the value of RPOPENTOKEN.  The RPOPENTOKEN is getting used in the next request.   when I right click on the RPOPENTOKEN  value in the respone the "Create Correlation"  option is inactive in the menu.

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