Thank you Amanjit!
I did generated new version and raised new request but still facing the same issue.
I checked the task setting to "All Approvers" too but still not able to locate the option where it shows "Roles" and approval/rejection on Roles rather than complete request.
Please see the attached screen and help me where I can locate the tab for approve/reject just Role A and Role B.
Appreciate your time.
Regards,
Salman