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Error on Firebase generateEmailVerificationLink in GCP Cloud Function

I'm trying to set up a GCP Cloud Function to generate the email verification link using admin.auth().generateEmailVerificationLink, but it throws the error:

Error: Credential implementation provided to initializeApp() via the "credential" property has insufficient permission to access the requested resource. See https://firebase.google.com/docs/admin/setup for details on how to authenticate this SDK with appropriate permissions.

I was able to reproduce this error with the following Cloud Function code:

index.js:

const admin = require('firebase-admin');

admin.initializeApp();

exports.helloWorld = (req, res) => {
  execute(res);
};

const execute = async (res) => {
  const email = 'test@test.com';
  const url = 'https://my-amazing-app.firebaseapp.com';
  const link = await admin.auth().generateEmailVerificationLink(email, { url });
  console.log(link);
  res.status(200).send(link);
};

package.json:

{
  "name": "sample-http",
  "version": "0.0.1",
  "dependencies": {
    "firebase-admin": "^10.0.2"
  }
}

My Firebase Admin Service Account (firebase-adminsdk-XXX@my-project.iam.gserviceaccount.com) has the roles:

  • Firebase Admin SDK Administrator Service Agent
  • Service Account Token Creator

I also viewed the API Key in Firebase Console, found it in GCP (Browser key (auto created by Firebase), and see that it has the following APIs selected:

  • Cloud Firestore API
  • Cloud Functions API
  • Firebase Installations API
  • Token Service API
  • Identity Toolkit API

I tried following the provided link (https://firebase.google.com/docs/admin/setup), but it seems specific to setting up admin outside of a GCP Cloud Function (see https://firebase.google.com/docs/admin/setup#initialize-without-parameters). I also read through https://firebase.google.com/docs/auth/admin/email-action-links, but there were no helpful details that I could find.

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