Ibibo Group / Goibibo — Coupon not working

I have booked train ticket from Thane to Miraj jn of 31 May in go confirm category in which I suppose to get 2x refund.
My booked ticket got cancelled because it not get confirmed after the preparation of chart
I got my first actual refund and the voucher code
But when I am going to book another ticket through that voucher it not reflecting any kind of discount on the ticket it just showing (Sorry! Promo code used is not applicable at the moment)
It is of 2880rs voucher
Kindly I request you to look into it as soon as possible and solve my problem

Booking Id: TRNAV0GLCR1LBUWT