How to access extensionContext in a UIHostingController subclass?

Question

I'm fairly new to extensions in iOS and would like to use SwiftUI for the extension

so I've subclassed UIHostingController and then I've tried to access the extensionContext as I was previously in a UIViewController I had previously set as the class in the storbyboard.

I thought this was a complete implemention of UIViewController? It appears extensionContext is only populated when you use a UIViewController as the root?

How can I go about rendering SwiftUI view and pass the provided items down?

class ShareViewController: UIViewController {
//    @IBOutlet var container: UIView!

    override func viewDidLoad() {
        super.viewDidLoad()

        guard let extensionItems = extensionContext?.inputItems as? [NSExtensionItem] else {
            return
        }
        // in the debugger I get here and theres 1 item in the extensionItems
        for extensionItem in extensionItems {
            if let itemProviders = extensionItem.attachments {

class MainSwiftUIView: UIHostingController<MainUIView> {
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder, rootView: MainUIView(urlShared: ""))
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()

        guard let extensionItems = self.extensionContext?.inputItems as? [NSExtensionItem] else {
            return // debugger exits here... :(
        }
        // the debugger doesn't reach here 
        for extensionItem in extensionItems {