ios - "Invalid Token" when trying to authenticate phone number using firebase

Question

This is my code:

import FirebaseAuth


class AuthPhoneNum {

    static func getPhoneNum(phoneNumber: String) {
        PhoneAuthProvider.provider().verifyPhoneNumber(phoneNumber) { (verificationID, error) in
            if let error = error {
                print(error)
                return
            }
            UserDefaults.standard.set(verificationID, forKey: "authVerificationID")
        }
    }

    static func verify(verificationCode: String?) {
        guard let verificationID = UserDefaults.standard.string(forKey: "authVerificationID") else { return }
        if verificationCode != nil {
            let credential = PhoneAuthProvider.provider().credential(
                withVerificationID: verificationID,
                verificationCode: verificationCode!)

            Auth.auth().signIn(with: credential) { (user, error) in
                if let error = error {
                    print(error)
                    return
                }
            }
        } else {
            print("No verification code")
        }
    }

}

This is what the console prints out:

Error Domain=FIRAuthErrorDomain Code=17048 "Invalid token." UserInfo={NSLocalizedDescription=Invalid token., error_name=INVALID_APP_CREDENTIAL}

What am I doing wrong? Thanks

Answer 1

Waitting for answers