WhatsApp Business Cloud API: Message Accepted but Not Delivered

I’m using the WhatsApp Business Cloud API to send a template message. The API request returns a status of “accepted,” but the recipient is not receiving the message.

Request Details:

• Request URL:

  POST https://graph.facebook.com/v20.0/<phone_number_id>/messages
  

• Request Body:

  {
      "messaging_product": "whatsapp",
      "recipient_type": "individual",
      "to": "<Mobile Number>",
      "type": "template",
      "template": {
          "name": "booking_details",
          "language": {
              "code": "en"
          },
          "components": [
              {
                  "type": "body",
                  "parameters": [
                      {"type": "text", "text": "chennai"},
                      {"type": "text", "text": "salem"},
                      {"type": "text", "text": "tn15505"},
                      {"type": "text", "text": "star"},
                      {"type": "text", "text": "23.02.2024"},
                      {"type": "text", "text": "koyambedu"},
                      {"type": "text", "text": "bus stand"},
                      {"type": "text", "text": "10:00 a.m."},
                      {"type": "text", "text": "₹5055"},
                      {"type": "text", "text": "L1/S,L2/S"}
                  ]
              },
              {
                  "type": "button",
                  "sub_type": "quick_reply",
                  "index": "0",
                  "parameters": [
                      {
                          "type": "payload",
                          "payload": "PAYNOW_PAYLOAD"
                      }
                  ]
              },
              {
                  "type": "button",
                  "sub_type": "quick_reply",
                  "index": "1",
                  "parameters": [
                      {
                          "type": "payload",
                          "payload": "CHANGE_DETAILS_PAYLOAD"
                      }
                  ]
              }
          ]
      }
  }
  

Response:

{
    "messaging_product": "whatsapp",
    "contacts": [
        {
            "input": "receiver",
            "wa_id": "id"
        }
    ],
    "messages": [
        {
            "id": "wamid.HBgMOTE4MDU2MTg1NjI5FQIAERgSMUQwQzU3MjVENDBBMEQ5NTk5AA==",
            "message_status": "accepted"
        }
    ]
}

What I’ve Tried:

• Verified that the template is approved and matches the template ID.
• Confirmed the recipient’s phone number is registered with WhatsApp.
• Ensured the phone_number_id and access token are correct.
• Checked that the recipient has opted in to receive messages.
• Verified there’s no issue with my WhatsApp Business Account (no low-quality rating or rate limiting).

Despite the message being accepted, it’s not delivered to the recipient. What could be the reasons for this, and how can I troubleshoot or resolve this issue?