No option to add User and Roles to iTunesConnect

I have an enrolled an apple account and i have membership of developer portal.

Recently my client wanted me to use testflight and as long as i researched regarding testflight. It says i have to add "User & Roles" in first step.

But i cant see any option for "User & Roles" under iTunesConnect. Also i have Admin rights but still cant see that option.

The person who is team agent can see this option but when adding users there is no option to select "Technical"

Please help whether any different enrolment needed to use Apple Testflight for testing purpose?