Device not response on server url

Hi Everyone I'm Using this package to send MDM push notification

from apns2.client import APNsClient, NotificationType
from apns2.payload import Payload
def PingDevice(cls, devicetoken, pushmagic):
# Send request to Apple
print('Send request to Apple')
topic = "com.apple.mgmt.External.ff2ea8ba-350c-4e1d-9a0d-cf8f62c06086"
    # Path to your VoIP certificate
    cert_path = os.path.join(settings.BASE_DIR, 'sign', "PushCert.pem")

    # Initialize the client
    client = APNsClient(cert_path, use_sandbox=False, use_alternative_port=False)

    # Prepare the payload
    payload = Payload(custom={"mdm": pushmagic.decode('utf-8')})

    try:
        # Send the notification
        response = client.send_notification_async(token_hex=base64.b64decode(devicetoken).hex(), notification=payload, topic=topic,push_type=NotificationType.MDM)
        result = client.get_notification_result(response)

        print(f"Notification sent successfully: {result}")
        return True
    except Exception as e:
        print(f"Error sending notification: {e}")
        return False

notification was sent successfully but the device did not respond on my server URL please tell me why this happened.