WhatsApp API Setup & Troubleshooting - 3K INR

I need help setting up the WhatsApp Cloud API for my business. Our business and phone numbers are verified, and our message templates are approved.

However, we encounter the following error when using the send message API:

{
"error": {
"message": "(#131032) Invalid Test Phone Number",
"type": "OAuthException",
"code": 131032,
"error_data": {
"messaging_product": "whatsapp",
"details": "Unable to send message - Invalid test phone number: Unable to send message due to an invalid test phone number. Reach out to direct support (Resource > Contact Support) for help."
},
"fbtrace_id": "AUh8pP1RkYga9XFBJZHselw"
}
}

Ideal Skills and Experience:
- Experience with WhatsApp Cloud API
- Familiarity with API error troubleshooting
- Ability to navigate WhatsApp support systems