Apple Sign In with Expo and Firebase "credential failed: First argument "idToken" must be a valid string or null"

Please provide the following:

  1. SDK Version: 36.0.0
  2. Platforms(Android/iOS/web/all): Ios


I have implemented Apple Sign In in my expo managed app with firebase.

It was all working perfectly and had been deployed to the app store successfully.

I have followed these steps from

A couple of days later I submitted a new build, without changing anything in the apple signIn logic to my knowledge.

Now I get the following error on the new TestFlight build or in Expo: “credential failed: First argument “idToken” must be a valid string or null”, although I can log the idToken properly which is a string as it is supposed to be.

I have tried:

  • uninstalling and reinstalling node modules and run again
    expo install expo-apple-authentication

  • delete my app from my apple id manager, and try sign in again

  • I have tried with and without the “nonce” value

The Apple Sign in is still working in the public App Store build.

Could this be because of multiple builds co existing maybe ?

Thank you !

My Apple SignIn code :

renderAppleLoginButton = () => {

if (this.state.available === true) {

return (       
      style={{ width: 250, height: 50 }}
      onPress={async () => {
      try {
        const csrf = Math.random().toString(36).substring(2, 15);
        const appleCredential = await AppleAuthentication.signInAsync({
          requestedScopes: [
          state: csrf,                         
        let { identityToken, email, state } = appleCredential
        if (identityToken) {
        console.log('identityToken', identityToken)
        const provider =  new firebase.auth.OAuthProvider("");
        console.log('provider', provider)
        const credential = provider.credential({
          idToken: identityToken,   
        console.log('credential', credential)      
       const {uid} = await this.authenticateApple(credential)
       this.createUserApple(uid, email) 
        // signed in
      } catch (e) {
        if (e.code === 'ERR_CANCELED') {
        } else {
          // handle other errors
          this.setState({error: e.message})


Fixed after upgrading firebase and reinstalling expo-apple-authentication

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