Message Delivery Issue - Error Code 131026 (Message Undeliverable) How do i resolve this issue?

API Version: v18.0 Business ID: 644134374239655 WhatsApp Business Account ID: Ace Tools (171710262688364) Phone Number: Ace Tools (+91 62878 59750)

phoneNumberId = '147572895113819'; // Set your phone number ID here apiUrl = "https://graph.facebook.com/v16.0/{$this->phoneNumberId}/messages";

Please help me in resolving the issue. Have the shared the details also. It is hampering a major part of my communication and marketing through Meta.

Awaiting your response on the same.