Apple pay isn't working on the Magento Site

I have my store in Magento and I am using Cybersource to integrate ApplePay with Magento. I followed this link (page 56 to 66) to setup the ApplePay on the store.

After setup completed, button of ApplePay is visible on the storefront but I am not able to click that button. Nothing happens on the Apple Pay button click - No JS error, no Logs in the safari devtools nothing.

Here is the snapshot od the merchant ID configuration- snapshot

I tried this on the iPhone 12 (iOS 14) - screenshot

Does any one faced this kind of issue on Magento or any other platform?