Add UIView and UILabel programmatically on Mac OS

I am trying to add a UIView then a UILabel as a subview on Mac OS and iPad. if I call the following function in loadView() and run the iPad simulator the background turns white and my UILabel appears in the middle where its supposed to. If I run the Mac OS simulator, the background turns white but I have no text. The app is a UIKit app with the checkbox to run on Mac using Mac Catalyst checked.

Any ideas as to why its not showing my UILabel when I run on Mac OS Sim?

func coreIdea() {
    
    view = UIView()
    coreIdeaLabel = UILabel()
    
    view.backgroundColor = UIColor.white
    
    coreIdeaLabel.translatesAutoresizingMaskIntoConstraints = false
    coreIdeaLabel.textAlignment = .center
    coreIdeaLabel.text = "CoreIdea"
    coreIdeaLabel.font = UIFont.systemFont(ofSize: 24)
    
    view.addSubview(coreIdeaLabel)
            
    NSLayoutConstraint.activate([
        coreIdeaLabel.centerXAnchor.constraint(equalTo: view.centerXAnchor),
        coreIdeaLabel.centerYAnchor.constraint(equalTo: view.centerYAnchor)
    ])
}