firebase-functions: user.create function not triggered for Phone Auth

Version info

firebase-functions: 0.5.7

firebase-tools: 3.9.0

firebase-admin: 4.2.1

Test case

This is the function index.js

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

// Initialize Admin with configuration
admin.initializeApp(functions.config().firebase)


exports.fillInitialUserProfile = functions.auth.user().onCreate((event) => {
  const user = event.data
  const db = admin.database()

  return db.ref(`users/${user.uid}`).set({
    displayName: user.displayName || `Member (${user.phoneNumber})`,
    roles: []
  })
})

Steps to reproduce

• Deploy the functions
• Remove existing users in the Console so that it starts anew (like a new user being created)
• Authenticate using Phone number and be sure that login was successful

Were you able to successfully deploy your functions?

There was no error during deployment of the functions

i  deploying functions
i  functions: ensuring necessary APIs are enabled...
i  runtimeconfig: ensuring necessary APIs are enabled...
✔  runtimeconfig: all necessary APIs are enabled
✔  functions: all necessary APIs are enabled
i  functions: preparing functions directory for uploading...
i  functions: packaged functions (931 B) for uploading
✔  functions: functions folder uploaded successfully
i  starting release process (may take several minutes)...
i  functions: updating function fillInitialUserProfile...
✔  functions[fillInitialUserProfile]: Successful update operation. 
✔  functions: all functions deployed successfully!

✔  Deploy complete!

Expected behavior

• Logs should at least report errors if my function is doing something wrong
• Under functions Dashboard, the executions count should be incremented to 1.
• In the database, the users/…/* should be populated for the user

Actual behavior

• No logs whatsoever recorded
• Under functions Dashboard, the executions count remains 0.
• In the database, the users/.../* is empty