Error while implementing API in my code

I am implementing my API in the code and running tests in three different environments:

My code.
Postman.
The documentation provided.
In all cases, I encounter the same error: {
"error": null,
"data": {
"token": "eyJ0b2tlbiI6ICJiZmJmY2MyNDJlNzE0MDZjODk1Y2JkZmMzNTg3ZTY1ZSIsICJ0b2tlbl90eXBlIjogInNhX2Zyb21fcmVndWxhciIsICJjcmVhdGVkX2F0IjogMTczMjAyNTQ3MX0="
}
}

I would like to know how to resolve this issue.
I am attaching examples of the code, configuration used, and the results obtained to assist in the analysis.

Thank you in advance for your support!