C:\Users\purus>firebase login --no-localhost --reauth --debug
[2026-06-18T11:51:31.707Z] >>> [apiv2][query] POST https://auth.firebase.tools/attest [none]
[2026-06-18T11:51:31.708Z] >>> [apiv2][body] POST https://auth.firebase.tools/attest {"session_id":"7966cbb3-142a-46b4-b571-e92f722dcd9c"}
[2026-06-18T11:51:32.374Z] <<< [apiv2][status] POST https://auth.firebase.tools/attest 200
[2026-06-18T11:51:32.374Z] <<< [apiv2][body] POST https://auth.firebase.tools/attest {"token":"yJah2vT3KoOXOwvO7LZda_h8aE0tl5KTwiG68UK3CZQ"}

To sign in to the Firebase CLI:

1. Take note of your session ID:

   7966C

2. Visit the URL below on any device and follow the instructions to get your code:

   https://auth.firebase.tools/login?code_challenge=AeIjhcJ5ZQk9VfnNwNbDRz1Qnjj4qZt69Hb7Ek9oRvM&session=7966cbb3-142a-46b4-b571-e92f722dcd9c&attest=yJah2vT3KoOXOwvO7LZda_h8aE0tl5KTwiG68UK3CZQ

3. Paste or enter the authorization code below once you have it:

√ Enter authorization code: 4/0AdkVLPx31jGpY5NaS430JKunW2-w9iGknbn-O3Vpn6QYsWG-aJHqiUGX7w3b5VAzNMaNlA
[2026-06-18T11:51:57.133Z] >>> [apiv2][query] POST https://accounts.google.com/o/oauth2/token [none]
[2026-06-18T11:51:57.134Z] >>> [apiv2][body] POST https://accounts.google.com/o/oauth2/token [omitted]
[2026-06-18T11:51:57.312Z] Token Fetch Error: FirebaseError: FetchError: Invalid response body while trying to fetch https://accounts.google.com/o/oauth2/token: Premature close
    at RetryOperation._fn (F:\node-v24.17.0-win-x64\node_modules\firebase-tools\lib\apiv2.js:317:88)
    at process.processTicksAndRejections (node:internal/process/task_queues:104:5)
Authentication Error: Your credentials are no longer valid. Please run firebase login --reauth

For CI servers and headless environments, generate a new token with firebase login:ci

Error: Unable to authenticate using the provided code. Please try again.

C:\Users\purus>curl -X POST -I https://accounts.google.com/o/oauth2/token
HTTP/1.0 411 Length Required
Content-Type: text/html; charset=UTF-8
Referrer-Policy: no-referrer
Content-Length: 1564
Date: Thu, 18 Jun 2026 11:53:09 GMT