Localstorage Not Working Issue Reactjs Nodejs

When I Am Proceeding To SignUp LocalStorage is not Working When See In Console There Is No Error And When I Watched Network It Is Showing Pending Backend Is Working Properly But Still Only That Sign Up Is Not Working My auth.js file code is :

const authReducer = (state= {data :null}, action) => {
   switch (action.type) {
    case 'AUTH':
        
        localStorage.setItem('Profile', JSON.stringify({...action?.data}));
        return { ...state, data: action?.data }
    default:
        return state;
   }
}

export default authReducer