Great question — answering as the UphillTech team:
Twilio developer evangelist here. I've not used GoHighLevel, so this is a bit of a stab in the dark. Incoming messages to a Twilio number trigger a webhook (an HTTP request) to an application to notify the application. If the webhooks aren't set up correctly, then those messages won't make it to the other application (though they are all stored within Twilio). I would recommend you log in to your Twilio account and check the settings for your numbers. You want to ensure that your numbers have a GoHighLevel URL setup for incoming messages. In one of the GoHighLevel support topic videos for Twilio I spotted what the webhook URL should probably look like....
Full answer by philnash: https://stackoverflow.stackexchange.com/a/65659977 (CC BY-SA 4.0).
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