nextAssignmentID using DX API

Hi, I am using Pega API V1 to create case.

I would need “nextAssignmentID” in the response to make further API calls. I created the new case type 8.5.2, I see the create case is not having “nextAssigmentID” in the response. What makes API to return nextAssignmentID. Am I missing a configuration? Please help.

@VENKATESH GUDEENTI The user id we are executing API should match with the user id to which the assignment being routed to. This configuration makes the API to return nextAssignmentID.