Stage Onboarding Issue for more than 500 users

We added few users to Sigma Stage pxed group – sigmaui_rw , but we are unable to fetch those user details from the drop-down box in "Onboard New User Screen". Please look at few examples below – users ( Wysocki, David ; Gururani, Mukund & Sinha, Abhishek Kumar ) are already part of sigmaui_rw stage pxed group. But we do not see their details in below drop-down list ( Refer Screenshot below ).

Fix: when we query PXED to provide users of particular group it returns max 500 users in one query(This is the restriction that is applied on PXED server).

To resolve this we can either ask PXED team to increase the no of records to return on a query or update our code to handle this scenario.