Whatsapp chatbot doesn't trigger in production

Hi, this is my first automation so I appreciate your assistance.

The automation is intended to collect initial data from customers via whatsapp, and once all necessary information is gathered, let the customer know one of our team members will reach out to them.

The flow works correctly while testing, but when activating it it never triggers when other numbers send a message. There are no error messages, simply no action happens. I suspect this is related to the configuration of my meta app, but can’t tell.

I have a permanent token created, which is why in my screenshot below there is no token. I found this other question in the community forum, but I don’t know if (1) the issue is the same, and (2) whether I should do a curl command within n8n/or perhaps the server where n8n lives?

Is it necessary to add a callback URL for the webhook? I believe it might not be since I’m using a Whatsapp trigger node instead of a webhook trigger. I tried doing that but I’m unable to find where the verification lives, or where I should create it.

I have the flow hosted in an EC2 server in AWS, with a valid SSL certificate. Apologies for the multiple questions and the need of handholding.

Thank you!