Axios baseURL is not appending with the URL in react.js

I had made the axios setup with saga.js, when the user clicks the Register button have to dispatch an action and it will hit the request, everything is working fine, except appending the baseURL in the url, the url http://users/register,

My axios setup,

 import axios from 'axios';

const axiosClient = axios.create({
    baseURL : `https://test-url.com/`
});


export function postRequest(URL, payload) {
    return axiosClient.post(`/${URL}`, payload).then(response => response);
}

saga.js

import { put, takeEvery, all, call } from 'redux-saga/effects';
import {register} from "./serviceWorker";
import { postRequest } from './helpers/axiosClient';
import actions from "./redux/actions";

function* registerUser(params) {
    try {
        const response = yield call(() => postRequest('/users/register', params.payload));
        console.log('response', response.data);
        yield put({
            type: actions.ON_REGISTER_SUCCESS,
            payload: response.data,
        });
    } catch (error) {}
}

function* watchIncrementAsync() {
    yield takeEvery('ON_REGISTER', registerUser)
}

export default function* rootSaga() {
    yield all([
        watchIncrementAsync()
    ])
}