oracle jet ajax problem

Hey all I am new to Oracle JET and I have a problem

we try to upgrade our app to version 12 and some of the code that works now does not function well

I try to do login into the app with ajax like before the upgrade and for some reason, I can't understand it not working and I don't get an output\error code that I can try to understand the problem.

this is the code the problem happen :

 await $.ajax({

                    url: self.rootModel.usersLoginRestURL(),

                    data: {

                        username: self.username(),

                        password: self.password()

                    },

                    type: 'POST',

                    xhrFields: {

                        withCredentials: true

                    },

                    error: function (request, status, error) {

                        console.log(`Login Failed.`)

                    },

                    statusCode: {

                        403: function(response) {

                          console.log(`Access Error: (Forbidden) Attempted access to forbidden resource.`);

                          alert(`Incorrect username or password when attempting login.`)

                         },

                        401: function(response) {

                            console.log(`Access Error: (Unauthorized) Incorrect username or password when attempting login.`)

                            alert(`Incorrect username or password when attempting login.`)

                        },

                    },          

                    success: (function (results){

                        const delay = Math.max(100, parseInt(results.accessTokenExpiryMillis) - 5000);

                        setTimeout(self.rootModel.refreshTokens, delay);

                        self.rootModel.accessToken(results.accessToken);

                        self.loginResponse(results)

                        console.log(results);

                    }),

                });

hope you can help.