Getting 404 on /oauth2/authorize

[MarkCockfield]

I am adding AuthJS v5 to a NextJS app running on AWS EC2 using nginx as a reverse proxy and AWS Cognito as the IdP. I get the "Sign in with Cognito" button, but when I click it I get the following 404 error:

URL: https://auth.higherendeavors.com/oauth2/authorize?response_type=code&client_id=5ahn5oc0157vmghljnhrcppbdr&redirect_uri=http%3A%2F%2Fwww.higherendeavors.com%2Fapi%2Fauth%2Fsession%2Fcallback%2Fcognito&code_challenge=5Yj7avxQVEOZV26GWmB5ry1-9Sg7l8jo8CaqHlIVQXE&code_challenge_method=S256&scope=openid+profile+email Status: 404 Not Found

I have not been able to figure out where this route is defined and any help would be greatly appreciated.