How to fix WhatsApp Click to chat link not finding WhatsApp messenger on phones

I have created a product page on an AppSheet app with a WhatsApp click to chat link. However, this link only opens the share on WhatsApp web page with correct number and pre-filled text(picture 1). When I click on send, the code can’t find WhatsApp on the phone and redirecting to install WhatsApp messenger(picture 2).

Below is the link I’m using: https://wa.me/260969XXXXX1?text=Hi,%20I’m%20interested%20in%20this%20Descriptive%20top%20bottom.%20Product%20ID:%209cf30b16

picture 1

picture 2 (apparently i can only upload one picture on this platform)

What could be the problem? How do I fix it?