Why is my whatsapp message not being sent? - whatsapp

Question

Testing with Postman, I'm trying to send a message per the glitch example project from docs
I'm trying to write an API endpoint I can hit with a webhook when people send a message to my Org's whatsapp number. The API would send an automated response.
When I send the POST, with the following body to https://graph.facebook.com/v14.0/redacted/messages it comes back with the following response:
{
"error": {
"message": "(#131030) Recipient phone number not in allowed list",
"type": "OAuthException",
"code": 131030,
"error_data": {
"messaging_product": "whatsapp",
"details": "Recipient phone number not in allowed list: Add recipient phone number to recipient list and try again."
},
"error_subcode": 2655007,
"fbtrace_id": "A5YKQbpB0PEaaA-gIROEv-n"
}
}
The error code isn't list one the error codes page, nor can I find anything about adding a recipient phone number anyway (it doesn't make sense to require a pre-defined list of recipient phone numbers to which I can send messages).
Here's the message body:
{
"messaging_product": "whatsapp",
"to": "redacted",
"text": {
"body": "Ack: Hello world"
}
}
How do I get the message sent? I'm not able to proceed with development of my app until I can send a message.

Answer 1

Just Remove + from your mobile number and add you country code before your number.
Then its working fine.
Request Body:
{
"messaging_product": "whatsapp",
"to": "91xxxxxxxxxx",
"type": "template",
"template": {
"name": "hello_world",
"language": {
"code": "en_US"
}
}
}
Response Body:
{
"messaging_product": "whatsapp",
"contacts": [
{
"input": "91xxxxxxxxxx",
"wa_id": "91xxxxxxxxxx"
}
],
"messages": [
{
"id": "wamid.HBgMOTE3NTM4OTE4MzIyFQIAERgSOERCM0ZDOTJFMDk1RjBFNURBAA=="
}
]
}
for Your Reference

Answer 2

I got the same error code and message here.
I was debugging it and see that the from number is a little different than the number I had registered when I will echo the message back.
You can put the number of phone hard coded that you have registered before to see it working.