Send SMS OTP not working properly

Hello! I tried to create a OTP flow and followed the instructions but the Send OTP node is not working as expected.

Screen Shot 2022-09-01 at 10.11.46 AM

I added the following nodes

  • Phone (response stored in string variable)
  • Send OTP
  • Question (response stored in a string variable)
  • Verify OTP

I’m still stuck at Send OTP, I never receive any SMS. I’ve tried prefixing ISD as well. Can someone help me with this?