Facebook log in error:

"Sorry, something went wrong. We are working on it and we ll get it fixed as soon as we can."

import FirebaseAuth
import FacebookLogin

private let facebookLoginButton: FBLoginButton = {
        let button = FBLoginButton()

        //button.permissions = ["email","public_profile"]
        button.permissions = ["public_profile", "email"]
        
        return button
    }()

override func viewDidLoad() {
        super.viewDidLoad()

        facebookLoginButton.delegate = self
        

        
        // Add subviews
        view.addSubview(scrollView)
        scrollView.addSubview(imageView)
        scrollView.addSubview(emailField)
        scrollView.addSubview(passwordField)
        scrollView.addSubview(loginButton)
        scrollView.addSubview(facebookLoginButton)
    }

override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()

        facebookLoginButton.frame = CGRect(x: 30,
                                           y: loginButton.bottom + 10,
                                           width: scrollView.width - 60,
                                           height: 52)
        facebookLoginButton.frame.origin.y = loginButton.bottom + 20
    }

{
    
    func loginButtonDidLogOut(_ loginButton: FBLoginButton) {
        // no operation
    }
    
    func loginButton(_ loginButton: FBLoginButton, didCompleteWith result: LoginManagerLoginResult?, error: Error?) {
        
        guard let token = result?.token?.tokenString else {
            if let error = error {
                print("User failed to log in with facebook: (error)")
            }
            return
        }
        
        let facebookRequest = FBSDKLoginKit.GraphRequest(graphPath: "me",
                                                         parameters: ["fields": "email, name"],
                                                         tokenString: token,
                                                         version: nil,
                                                         httpMethod: .get)
        
        
        
        facebookRequest.start(completionHandler: { _, result, error in
            guard let result = result as? [String: Any], error == nil else {
                print("Failed to make facebook graph request")
                return
            }
            
            guard let userName = result["name"] as? String,
                  let email = result["email"] as? String else {
                print("Failed to get email and name from fb result")
                return
            }
            
            let nameComponents = userName.components(separatedBy: " ")
            guard nameComponents.count == 2 else {
                return
            }
            let firstName = nameComponents[0]
            let lastName = nameComponents[1]
            
            DatabaseManager.shared.userExists(with: email, completion: { exists in
                if !exists {
                    DatabaseManager.shared.insertUser(with: ChatAppUser(firstName: firstName,
                                                                        lastName: lastName,
                                                                        emailAddress: email))
                }
            })
            
            let credential = FacebookAuthProvider.credential(withAccessToken: token)
            
            FirebaseAuth.Auth.auth().signIn(with: credential, completion: { [weak self] authResult, error in
                guard let self = self else {return}
                
                guard authResult != nil, error == nil else {
                    if let error = error {
                        print("Facebook credential login failed, MFA may be needed: (error)")
                    }
                    return
                }
                
                print("Successfully logged user in")
                self.navigationController?.dismiss(animated: true, completion: nil)
            })
        })
        
        
    }
    
    
}