scrollview scrolling on iphone x simulator but not other devices - ios

Question

I have the following code which sets up the layout of a signup view.
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = UIColor.mainWhite()
scrollView.isScrollEnabled = true
scrollView.contentSize = CGSize(width: view.frame.size.width, height: view.frame.size.height)
setupView()
addKeyboardObservers()
assignFirstResponders()
}
func setupView() {
view.addSubview(scrollView)
scrollView.translatesAutoresizingMaskIntoConstraints = false
scrollView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
scrollView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
scrollView.widthAnchor.constraint(equalTo: view.widthAnchor).isActive = true
scrollView.heightAnchor.constraint(equalTo: view.heightAnchor).isActive = true
scrollView.addSubview(logoView)
logoView.anchor(top: scrollView.topAnchor, left: nil, bottom: nil, right: nil, paddingTop: 10, paddingLeft: 0, paddingBottom: 0, paddingRight: 0, width: 110, height: 110)
logoView.centerXAnchor.constraint(equalTo: scrollView.centerXAnchor).isActive = true
let stackView = UIStackView(arrangedSubviews: [emailTextField, passwordTextField, confirmPasswordTextField, firstNameTextField, lastNameTextField, phoneNumberTextField , signupButton])
stackView.axis = .vertical
stackView.spacing = 4
stackView.distribution = .fillEqually
scrollView.addSubview(stackView)
stackView.anchor(top: logoView.bottomAnchor, left: scrollView.leftAnchor, bottom: nil, right: scrollView.rightAnchor, paddingTop: 8, paddingLeft: 60, paddingBottom: 0, paddingRight: 60, width: 0, height: 350)
stackView.centerXAnchor.constraint(equalTo: scrollView.centerXAnchor).isActive = true
scrollView.addSubview(alreadyHaveAccountButton)
alreadyHaveAccountButton.anchor(top: stackView.bottomAnchor, left: scrollView.leftAnchor, bottom: nil, right: scrollView.rightAnchor, paddingTop: 12, paddingLeft: 0, paddingBottom: 0, paddingRight: 0, width: 0, height: 50)
scrollView.addSubview(footerView)
footerView.translatesAutoresizingMaskIntoConstraints = false
footerView.leadingAnchor.constraint(equalTo: scrollView.leadingAnchor).isActive = true
footerView.widthAnchor.constraint(equalTo: view.widthAnchor).isActive = true
footerView.heightAnchor.constraint(equalToConstant: 70).isActive = true
footerView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
footerView.addSubview(termsAndPrivacyButton)
termsAndPrivacyButton.translatesAutoresizingMaskIntoConstraints = false
termsAndPrivacyButton.centerXAnchor.constraint(equalTo: footerView.centerXAnchor).isActive = true
termsAndPrivacyButton.centerYAnchor.constraint(equalTo: footerView.centerYAnchor).isActive = true
}
func assignFirstResponders() {
emailTextField.delegate = self
passwordTextField.delegate = self
confirmPasswordTextField.delegate = self
firstNameTextField.delegate = self
lastNameTextField.delegate = self
phoneNumberTextField.delegate = self
}
I need the view to scroll when the keyboard overlaps an input view. And I've seen plenty of solutions for that here that address that.
extension SignupViewController {
func addKeyboardObservers() {
NotificationCenter.default.addObserver(self, selector: #selector(SignupViewController.keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(SignupViewController.keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
}
#objc func keyboardWillShow(notification: NSNotification) {
scrollView.isScrollEnabled = true
var userInfo = notification.userInfo!
var keyboardFrame:CGRect = (userInfo[UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue
keyboardFrame = self.view.convert(keyboardFrame, from: nil)
var contentInset:UIEdgeInsets = self.scrollView.contentInset
contentInset.bottom = keyboardFrame.size.height + 15
scrollView.contentInset = contentInset
print("content inset: \(scrollView.contentInset) \nKeyboard frame \(keyboardFrame)")
}
#objc func keyboardWillHide(notification: NSNotification) {
let contentInset:UIEdgeInsets = UIEdgeInsets.zero
scrollView.contentInset = contentInset
scrollView.isScrollEnabled = false
}
}
The issue I'm encountering now is that the scrolling functionality is ONLY working on the iPhone X simulator. When I test on my actual iPhone 6s device, the scrolling does not work. I've tried all all simualtor devices and the scrollign only works on the iphone X simulator which is extremely strange. Has anyone encountered something like this?