I found one workaround, it seems inputAccessoryView is buggy, instead it works by adding the toolbar directly to the same view: view.addSubview(toolbar) NSLayoutConstraint.activate([ toolbar.leadingAnchor.constraint(equalTo: view.leadingAnchor), toolbar.trailingAnchor.constraint(equalTo: view.trailingAnchor), toolbar.bottomAnchor.constraint(equalTo: view.keyboardLayoutGuide.topAnchor) ])

I also just ran into this problem. Here Apple documents that this entitlement can be added, but then the app doesn't start anymore: https://webkit.org/web-inspector/enabling-web-inspector/ The only solution is to add the device UUID to your provisioning profile and distribute the development version.