After I click my touchableopacity I created in react native the button redirects to this function below, and when executed the function returns an error stating Error TypeError: undefined is not an object (evaluating 'verifier.verify') I don't understand why I am receiving this problem as I copied the code from the Firebase website https://firebase.google.com/docs/auth/web/phone-auth?authuser=0&hl=en#set-up-the-recaptcha-verifier. Thank you in advance for any answers!

function phoneSignIn(phoneNumber, navigation){
  // phoneNumber is a string ex: +11111111
  let appVerifier = window.recaptchaVerifier;
  signInWithPhoneNumber(auth, phoneNumber, appVerifier)
  .then((confirmationResult) => {
    window.confirmationResult = confirmationResult;
    navigation.navigate('Verification Code');
  }).catch((error) => {
    console.log("Error " + error);
    //returning error here
  });
}