"NetworkError when attempting to fetch resource" while trying to authenticate using CREATE method

Hello,
I’m trying to implement the authentication based on a REST API call.
I succeed last week to get a response from the server and now that I want to continue my work, it’s not ok anymore!
The POST request is successfull with Postman but when I try to use it with appgyver it fails.
I have a base URL set as : https://example.com/api/login.php
The CREATE RECORD is set with the 2 parameters which are requested by the api (email and password)
If I try to run a test with GET Collection I receive a response from the server but CREATE RECORD still return an error : “NetworkError when attempting to fetch resource”
Any help would be greatly appreciated.