Reservation API call - mail_owner is null

I have a reservation API configured.
It was working fine, but now I see that mail_owner is not being passed to my Reservation API.

Can someone tell me why this would be happening?

I followed direction in https://github.com/jitsi/jicofo/blob/master/doc/reservation.md

User’s are required to authenticate. We use custom http authentication.
Thank you.