MERN APP fargate deployment Documents

Hi, we try to deploy a MERN app in AWS fargate. We created two separate containers and deployed them to the fargate. Each is working fine separately. But we can't access the backend from frontend . We also configured the Cloudmap service but still we can't access it . Please anyone guide me where i miss anything.

Following error we got in network tap: Request URL: http://127.0.0.1:5001/api/user/login Referrer Policy: strict-origin-when-cross-origin