import { GoogleAuth } from 'google-auth-library';
const auth = new GoogleAuth();
const url = `${configList.baseURL}/dashboard`;
const targetAudience = "51297171365dbt6s3oc4d09cf.apps.googleusercontent.com";
async function IapAuth() {
    try {
            console.info(`request IAP ${url} with target audience ${targetAudience}`);
            const client = await auth.getIdTokenClient(targetAudience);
            const res = await client.request({
                url, headers: {
                    user-Agent: 'e2e.test'
                }
            });
            IAP_token = res.config.headers.Authorization
            process.env.IAP_token = IAP_token
            console.log(`√ Iap token has been obtained ----> ${JSON.stringify(IAP_token)}`)
    } catch (err: any) {
        console.error(JSON.stringify(`X ---> ${JSON.stringify(err.message)}`));
        process.exitCode = 1;
    }
}

But since our domain is protected by DataDome, we need to pass a certain user agent in the request in order to not be blocked by Recaptcha, but the solution above didn't work out  since my user agent is not overnight the existing one but it appends with it 

and I'm getting 

response: {
    config: {
      url: 'https://test.net/ch/test/en/accounts/mpre/dashboard',
      headers: [Object],
      paramsSerializer: [Function: paramsSerializer],
      validateStatus: [Function: validateStatus],
      responseType: 'json',
      method: 'GET'
    },
    data: {
      url: 'https://geo.captcha-delivery.com/captcha/?initialCid=AHrlqAAAAAMAcG9_Htx_-xsAJcnjBA==&cid=y4Yi1XOmjjBKzFYD5yHexjTu9D8m4fr7R8VJ0qXItUW6~ml8Qy29O9I4.35XmXgvk4p9x8GKyoGcSJ2a8xWgXhlzp1qBP1wcuZPGoD8XXA-70sd-l5qy1iIIxQ753Gx&referer=http%3A%2F%2Fim-search-demo-predev.pricehubble.net%2Fch%2Fimmoworlddashboard%2Fen%2Faccounts%2Fmpre%2Fdashboard&hash=9F1FB446984167FE5DE89E73FFEE6E&t=fe&s=32675&e=71208da2bdf44b4b6ce35cd599f70dfd86f153f9cde560aab23d80d53832f711'
    },
    headers: {
      'accept-ch': 'Sec-CH-UA,Sec-CH-UA-Mobile,Sec-CH-UA-Platform,Sec-CH-UA-Arch,Sec-CH-UA-Full-Version-List,Sec-CH-UA-Model,Sec-CH-Device-Memory',
      'alt-svc': 'h3=":443"; ma=2592000,h3-29=":443"; ma=2592000',
      'cache-control': 'max-age=0, private, no-cache, no-store, must-revalidate',
      charset: 'utf-8',
      connection: 'close',
      'content-length': '463',
      'content-type': 'application/json;charset=utf-8',
      date: 'Wed, 16 Nov 2022 13:31:58 GMT',
      pragma: 'no-cache',
      server: 'istio-envoy',
      'set-cookie': 'datadome=y4Yi1XOmjjBKzFYD5yHexjTu9D8m4fr7R8VJ0qXItUW6~ml8Qy29O9I4.35XmXgvk4p9x8GKyoGcSJ2a8xWgXhlzp1qBP1wcuZPGoD8XXA-70sd-l5qy1iIIxQ753Gx; Max-Age=31536000; Domain=.pricehubble.net; Path=/; Secure; SameSite=Lax',
      via: '1.1 google',
      'x-datadome': 'protected',
      'x-datadome-cid': 'AHrlqAAAAAMAcG9_Htx_-xsAJcnjBA==',
      'x-dd-b': '537',
      'x-envoy-upstream-service-time': '39'
    },
    status: 401,
    statusText: 'Unauthorized',
    request: {
      responseURL: 'https://test.net/ch/test/en/accounts/mpre/dashboard'
    }
  },
  config: {
    url: 'https://itest/ch/test/dashboard/en/accounts/mpre/dashboard',
    headers: {
      Authorization: 'Bearer eyJhbGciOiJSUzI1NaWF0IjoxNjY4NjA1NTE3LCJpc3MiOiJodHRwczovL2FjY291bnRzLmdvb2dsZS5jb20iLCJzdWIiOiIxMTc5NDk1NzQzODI4NTIwOTg3NTEifQ.HtGYf8R1NCE-MEgPDKvLz77gsdDpLPTbHpK26XYm1gAHhelOlObszZBMBbg3OhWc9VLStsg1rIHdv7VTEm3TB-v_orrpeTyQnqI11MvWvNWevJ4mr6KkDjO5AX8TKM9lOs-VBTVmHqWUcS3IADcpgJbExqwN42_0-VOUc0M9Wk_UC8lH0BaSXBwh5YNRkh5iNUnaTEmHa1bsqvV3Dcmhd1Lso3LtLJ80zcYz0nPVpdQdAESXp3nSOxETEdQ-ySFwF4NNZOy5CTp-AuJjmnpqHaGt7wDZGtf3Gux7f6Ps8e0rmZVnSHrK1T-LVtk6Z32yhb2ctM0ZsULIFFCaA2hOsw',
      'User-Agent': ' e2e_test' google-api-nodejs-client/8.7.0',   -----> need to change this
      'x-goog-api-client': 'gl-node/16.15.1 auth/8.7.0',
      Accept: 'application/json'
    },
    paramsSerializer: [Function: paramsSerializer],
    validateStatus: [Function: validateStatus],
    responseType: 'json',
    method: 'GET'
  },
  code: '401'
}