[Python] WhatsApp Business API: Failed to send message: 400 {"error":{"message":"(#135000)...

I am heaving problem with WhatsApp Api setup. I have already asked here but now I am going much deeper into the problem and giving you replicable solution in python.

This is a working solution for sending the default hello_world:

import requests
import json

phone_number_id = "xxx" # Your WhatsApp Cloud API phone number ID
access_token = "xxx"
template_name = "hello_world"

# Replace with the recipient's phone number in E.164 format:
recipient_phone = "whatsapp:+420602xxxxxx"

# WhatsApp Cloud API endpoint URL
url = f"https://graph.facebook.com/v15.0/{phone_number_id}/messages"

# HTTP headers
headers = {
"Authorization": f"Bearer {access_token}",
"Content-Type": "application/json"
}

# Payload for sending a WhatsApp template message
payload = {
"messaging_product": "whatsapp",
"to": recipient_phone,
"type": "template",
"template": {
"name": template_name,
"language": {"code": "en_us"},
"components": [
{
"type": "body",
"parameters": [
]
}
]
}
}

# Send the POST request
response = requests.post(url, headers=headers, json=payload)

# Check and print the response
if response.ok:
print("Message sent successfully:")
print(json.dumps(response.json(), indent=2))
else:
print("Failed to send message:")
print(response.status_code, response.text)


If I change the hello world to exactly same but my own created called "my_hello_world". I get this error:

Failed to send message:
400 {"error":{"message":"(#135000) Generic user error","type":"OAuthException","code":135000,"error_data":{"messaging_product":"whatsapp","details":"Generic user error"},"fbtrace_id":"AhxqWmU7Cl1iiCR-Jj7WD7A"}}


all bellow is correct:

• phone numer id
• access token
• recupient phone
• template name ( I have tried different and it gives me diff error)

What I tried:

• different profile
• different sending number
• recreate template
• used template without any parameters, headers
• different languages of the template (now using en_us) as the default hello world

Here is my previous question where I have used make.com to call the api with the same result.

here are pictures of the templates:

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