Passwordless SMS Login with Azure Communication Servivces

Hi I’m looking to setup passwordless SMS login using my Azure Communication Services. I set the email provider to azure communication services with the right email and connection string which works, but I setup the phone provider to send texts using Azure Communication Services and testing messages work. I then followed the docs here Set Up Custom SMS Gateway for Passwordless Connections to set the sms connection provider for passwordless to sms_gateway and I’m not exactly sure what I’m supposed to use for the gateway_url. Is there a way to use the custom phone provider I set up in the branding section for these passwordless sms or do I need to get up something else on our Azure side in order to authenticate and I should use the endpoint in Azure Communication Services as the gateway_url?

Thanks In advance!