update or delete cases

Hello everyone
I am using the Bonita rest api to create, update or delete cases, groups, users, roles or tasks and for all cases the rest api returns a 401
I use postman to make the requests according to the pretty documentation
for example to create a group
var axios = require('axios');
var data = JSON.stringify({
"icon": "",
"name": "manager",
"displayName": "department manager",
"description": "manager of the department"
});