502 Bad Gateway Error for OAuth2 Callback on AWS Deployment

Question

Experiencing a 502 Bad Gateway error when implementing the Microsoft Authentication flow. The entire flow works on the local machine, but an error occurs after deployment on AWS.

Redirect URL has HTTPS and it is correct.

{"message":"Service request error: Expecting value: line 1 column 1 (char 0)","status":"Bad Gateway","status_code":502,"timestamp":"2025-02-04T11:37:29.385445+00:00"}