Twilio SMS integration is one way messaging, which means that your customers won’t be able to reply to the SMS.
You must keep an eye on the phone numbers, they must be E.164 format if you click on the E.164 link you will be able to see that this is an example by Twilio but this rule is applied to all SMS providers in order everything to work properly.
Please use E.164 format like: +14155552671 in user/client phone number. Otherwise the SMS notification may will not work.
To learn more about the application please check all parts of this documentation. In this documentation, we'll describe how to configure this plugin according to the screenshots.