Bank account validation for Poland via OVF_MASS_CHECK

Hi Team,

We are trying to validate PL Bank account validations via tcode OVF_MASS_CHECK but it's not working.

We have done JAVA app deployment and CPI connection but it's not working and below error is coming in CPI

502: Bad Gateway error.

VAT Number validation is working fine but only Bank account number validation is not working via CPI.

We are on S4HANA 2021(private cloud) and CPI is on BTP. JAVA app is deployed but looks like it's not getting accessed by CPI.

Is there anyone who has worked on similar functionality and can share some insights ?

Thanks,

Vimal