Confused upon Advanced Card Processing

Hello,

We are Chinese merchant, and we noted PayPal support Advanced Card Processing now for Chinese merchant according to your latest update if I am correct:

Enhancement – Extend Advanced Card Processing country eligibility for China #2397

I tried to follow the following guide documents to test the feature of Advanced Card Processing:

https://woocommerce.com/document/woocommerce-paypal-payments/#sign-up-for-advanced-card-payments

https://developer.paypal.com/docs/checkout/advanced/customize/3d-secure/test/

Visa: 4868719460707704

expiration date 01/2025 and the CVV 123

But I got the following error:

Failed to process the payment. Please try again or contact the shop admin. [UNPROCESSABLE_ENTITY] PayPal rejected the payment. Please reach out to the PayPal support for more information. https://developer.paypal.com/docs/api/orders/v2/#error-PAYMENT_DENIED

Please check the screenshot:

https://prnt.sc/1404FWg5fgMf

Also, I got the failed order in Woo orders.

I am quite confused here upon how to test the Advanced Credit and Debit Card, and I tried to enable Sandbox mode on the connection tab at https://mysite.com/wp-admin/admin.php?page=wc-settings&tab=checkout§ion=ppcp-gateway&ppcp-tab=ppcp-connection, but the form of Advanced Card tab at backend and form at checkout page disappeared once the sandbox mode was enabled.

So, could you please clarify what is the right way to test Advanced Card Processing?

Thanks