Hi @lohith.IN,
Sailpoint is a technical partner of Duo’s, and they developed the integrations in IndentityIQ and IdentityNow.
Based on that error text, it may be that the Sailpoint Duo integration does some Duo API host checking and it might not recognize a Duo Federal API host.
I suggest contacting Sailpoint support as your next step. We at Duo cannot change the integration Sailpoint developed.