I’m trying to book internal india domestic travel with indigo. I’m us based and trying us issued credit cards. None of my visa or Mastercards work for booking. It looks like the site/app are both trying to pop up an intermediate security check that doesn’t display and then it places tje PNR on hold. I tried using an Amex and that went through to the SMS passcode and pop up. I’d prefer to use the citi MC as it offers much better travel protection. I don’t see any way to contact indigo to complete an on hold ticket either.