Australia, New Zealand and Singapore have recently introduced new regulations requiring SMS senders register with the government and pay ongoing fees to registration authorities and/or required SMS senders register and send from local numbers. This follows other countries like the United States rolling out similar regulations.
At this moment, we unfortunately do not have the sender volume to these countries to justify the ongoing registration costs, and so we're blocking sending to these countries for now.
If you're interested in sending SMSs to these countries, please express your interest here and state which country you'd like to send to:
https://propel-commerce.upvoty.com/b/propel-appointments-feature-requests/
Once we have sufficient interest, we can begin the registration process and re-enable sending to these countries.