[Python] Error in Sending Automated SMS with Dialpad and CVS File

I'm using python to send automated sms messages via Dialpad using the contacts I have in my CVS file (it's formatted as NAME, PHONENUMBER).

However I keep getting this error - example names and numbers used here:

Error sending SMS to Bob (+16124855917): b'Not Found'
Error sending SMS to Larry (+17699643423): b'Not Found'
Error sending SMS to Harry (+12538355287): b'Not Found'
Error sending SMS to Barry (+16128562388): b'Not Found'
Error sending SMS to Gary (+12129748516): b'Not Found'



The python code:

import csv
import requests

DIALPAD_API_KEY = 'MY-API-KEY'
DIALPAD_PHONE_NUMBER = 'MY-PHONE-NUMBER'

def send_sms_message(name, phone_number):
if not phone_number.startswith('+'):
phone_number = f'+1{phone_number}'
url = 'https://dialpad.com/api/v2/sms_messages'
headers = {
'Content-Type': 'application/json',
'Authorization': f'Bearer {DIALPAD_API_KEY}'
}
data = {
'from_number': DIALPAD_PHONE_NUMBER,
'to_number': phone_number,
'text': f'Is this {name}? I want to make sure I have the right number.'
}
response = requests.post(url, headers=headers, json=data)
if response.status_code == 200:
print(f'SMS sent to {name} ({phone_number}) successfully')
else:
print(f'Error sending SMS to {name} ({phone_number}): {response.content}')
return response.status_code

with open('recipients.csv', 'r') as f:
reader = csv.reader(f)
for row in reader:
name = row[0]
phone_number = row[1].replace(' ', '') # Remove any whitespace
send_sms_message(name, phone_number)


I expected the message to be sent to each phone number with their names.

How can I solve the issue?

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