CASDK-0004 Connectivity Error Between OIC And ERP Using OAuth Security Policy

Hi Experts ,

We are trying to establish connectivity between ERP and OIC. In OIC we are using ERP adaptor to connect to fusion. We intend to use OAuth Authorization Code Credentials as security policy.

We have referred to the following documentation -

Prerequisites for Creating a Connection (oracle.com) (Section -Perform Prerequisites to Use the OAuth Authorization Code Credentials Security Policy)

we have also referred to the video from Oracle Developers channel - https://www.youtube.com/watch?v=HY1rVixlcPo

Following these links I am able to provide consent in the adaptor connection setting

but when i try and test the connection it gives me  CASDK-0004 Connectivity Error Between OIC And ERP Using OAuth Security Policy error.