urgent help

Trish
My work want me to join back after 3 months , when I got pregnant I spoke To my manager and she agreed that I can wfh for a year (3 more ladies who had babies did the same ) , just before I was Leavibg manager changed and new manager was in other office . Now my HR emailed me saying I have to join in office. I have to type a reply about wfh and give a reason why.my office don't have a pumping room and my baby is exclusively on my milk , I pump . Please help me type an email