UICloudSharingController showing blank

Question

I've been trying for a week to make sharing work, using coredata, still no luck. Now I've made the simplest code to see if something works:

struct CloudKitShareView: UIViewControllerRepresentable {
    
    @ObservedObject var controller: MainViewController
    
    func makeUIViewController(context: Context) -> UICloudSharingController {
        
        let container = PersistenceController.shared.container
        
        let cloudSharingController = UICloudSharingController { controller, completion in
            container.share(self.controller.expenses, to: nil) { objectIDs, share, container, error in
                completion(share, container, error)
            }
        }

        return cloudSharingController
    }

    func updateUIViewController(
        _ uiViewController: UIViewControllerType,
        context: Context
    ) { }
}

when i call it using

.popover(isPresented: $controller.presentSharingController) {
                CloudKitShareView(controller: controller)
            }

it shows a blank screen and nothing happens, help me understand please! Thank you