Issue with Test Users in Sandbox Environment Unable to Complete Payment on Apple Pay Demo Page

I am writing regarding an issue I have encountered while attempting to complete a payment using test users created within the Sandbox environment of Apple Pay. The problem persists specifically when trying to make payments through the demo page at https://applepaydemo.apple.com/.

Problem Description:

When initiating a payment process with either of the following test user accounts.

The flow proceeds as follows:

1. The Apple Pay window appears correctly.
2. Processing begins but does not conclude successfully.
3. After processing concludes, there is no prompt for 'Pay with Touch ID'.

Additional Information:

• Device & OS Version: MacOS 15.3.2
• Browser & Version: Safari 18.3.1
• Real Device or Simulator: Real device used
• First Occurrence: Before January 1st, 2025
• Custom Configurations or Backend Used: No custom configurations or backend modifications are being utilized during interaction with the demo page.

Could you please provide assistance in resolving this issue?