Trying to make a basic auth API call from Office Script

Question

Using this and it fails to fetch. Where am I missing it

async function main(workbook: ExcelScript.Workbook) {

const response = await fetch('https://postman-echo.com/basic-auth', {
    method: 'GET',
    headers: {'Authorization':'Basic cG9zdG1hbjpwYXNzd29yZA=='}
});
const jsonData: object[] = await response.json();
console.log(jsonData);