How to test with invalid OTP in the 3DS Challenge Form in Sandbox

In addition to our production setup. (This is really urgent as we are nearing live and would really appreciate your help @Bryan-Square )

Can you explain why this option is disabled on our end. Application ID: sq0idp-cXig4CRC0Zv8k-L24-3Vqg
How do we update our APIs to enable 3DS rules

This documentation suggests to use verifyBuyer. And it is really confusing because in other documentation, it says that it is deprecated
However, I have already called verifyBuyer at least once but the option is still disabled