site user registration

Question:
Hello, please help. I made my own registration form for site users. But the request returns an error:
Cannot read properties of undefined (reading ‘status’)

Code:

import { authentication } from 'wix-members-frontend';

$w.onReady(function() {
     $w('#registerButton').onClick(function () {
         const email = $w('#email').value;
         const password = $w('#password').value;
         const firstName = $w('#firstName').value;
         const lastName = $w('#lastName').value;

         authentication.register(email, password, {
             contactInfo: {
                 firstName: firstName,
                 lastName: lastName
             }
         })
         .then((registrationResult) => {
         console.log(registrationResult.status);
          })
         .catch((error) => {
             console.error(error);
         });
     });
});