Why can't get metadata using `/api/v2/users/` endpoint?

I have three environment to work programs.
Docker, and two AWS EC2 instances.

In docker enviroment, I can use the endpoint /api/v2/users/ and it can get user’s informations.
However it can’t get user’s informations on EC2 instance.(It’s same program code.)

Why does this phenomenon happen?
I wonder.

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