Firebase Error - Invalid Idp Response: access_token is invalid

[Steven Beaulieu]

Hi there, I am working with Amazon's Alexa Skills kit and attempting to use a linked Google Account to then authenticate a user in Firebase. I have the account linking completed and an access token is being sent to my Lambda function properly. However, when I pass that access token into the "" method and attempt to authenticate, Firebase returns this error. I cannot find anything meaningful to debug or change that would change this outcome...

Firebase Auth Error: { [Error: {"error":{"errors":[{"domain":"global","reason":"invalid","message":"Invalid Idp Response: access_token is invalid"}],"code":400,"message":"Invalid Idp Response: access_token is invalid"}}]

This is the code used to re-authenticate using the provided access token (via Lambda / Node.js):

// ...
var access_token = this.event.session.user.accessToken;

// ...

var provider = new firebase.auth.GoogleAuthProvider();

// Build Firebase credential with the Google ID token.
var credential = provider.credential(null, access_token);

// Sign in with credential from the Google user.
firebase.auth().signInWithCredential(credential)
.then(function(result) {
  // ...
})
.catch(function(error) {
  console.log("Firebase Auth Error: ", error);
  // ...
});

The most interesting bit is the fact that even though I get an error response, the user is still showing up in my console as though they properly authenticated...

Any insight would be appreciated... Thank you

[Kato Richardson]

Hi Steven,

An entry in the console just means that a unique Firebase ID was assigned to that OAuth identity. It doesn't mean they authenticated in any way.

No idea why it's invalid, and just assuming you're specifying the right token--how did you verify that? Could it be expiring?

☼, Kato

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Kato Richardson |

Developer Programs Eng |

kato...@google.com |

775-235-8398

[Bassam]

Hey Steven, the access token you are using may have been generated by a different Google OAuth client project than the project you are using for the Firebase application.

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