MultipeerConnectivity in SwiftUI?

I tried now two different approaches (MCAdvertiserAssistant / MCBrowserViewController and MCNearbyServiceAdvertiser / MCNearbyServiceBrowser) to implement this in my first Swift app but always got the result that it stays at "Connecting" for a few seconds and than just declines the request. In a video from Hacking with Swift there was a popup if the connection should be accepted - this never comes up on my devices. So maybe this is the error already?

As for the browser part, I use this ViewController wrapper to make it available:

Code Block 
import MultipeerConnectivity
import SwiftUI
struct MultipeerConnectivityBrowserView: UIViewControllerRepresentable {
  func makeUIViewController(context: UIViewControllerRepresentableContext<MultipeerConnectivityBrowserView>) -> MCBrowserViewController {
    let service = MultipeerConnectivityService.instance()
    guard let session = service.session else {
      print("Failed to load MCSession for Browser")
      return MCBrowserViewController()
    }
     
    let viewController = MCBrowserViewController(serviceType: service.serviceType, session: session)
    viewController.delegate = service
     
    return viewController
  }
  func updateUIViewController(_ uiViewController: MCBrowserViewController, context: UIViewControllerRepresentableContext<MultipeerConnectivityBrowserView>) {
  }
}
struct MultipeerConnectivityBrowserView_Previews: PreviewProvider {
  static var previews: some View {
    MultipeerConnectivityBrowserView()
  }
}

I can see my 2nd device in the upcoming dialog but when I click on it, as described above, it just hangs at "Connecting" until it, as it seems to me, timed out.

This is currently the main implementation for the MC in my app:

Code Block 
import MultipeerConnectivity
class MultipeerConnectivityService: NSObject, MCSessionDelegate, MCBrowserViewControllerDelegate, MCAdvertiserAssistantDelegate {
		private static var internalInstance: MultipeerConnectivityService? = nil
		
		let serviceType = "sn-dueladviser"
		let peerID = MCPeerID(displayName: UIDevice.current.name)
		
		var session: MCSession?
		var advertiserAssistant: MCAdvertiserAssistant?
		
		static func instance() -> MultipeerConnectivityService {
				if let instance = internalInstance {
						return instance
				}
				
				internalInstance = MultipeerConnectivityService()
				return internalInstance!
		}
		
		private override init() {
				super.init()
				
				session = MCSession(peer: peerID, securityIdentity: nil, encryptionPreference: .required)
				session?.delegate = self
		}
		
		func startHosting() {
				guard let session = session else { return }
				advertiserAssistant = MCAdvertiserAssistant(serviceType: serviceType, discoveryInfo: nil, session: session)
				advertiserAssistant?.delegate = self
				
				advertiserAssistant?.start()
		}
		
		func session(_ session: MCSession, didReceive stream: InputStream, withName streamName: String, fromPeer peerID: MCPeerID) {
				
		}
		
		func session(_ session: MCSession, didStartReceivingResourceWithName resourceName: String, fromPeer peerID: MCPeerID, with progress: Progress) {
				
		}
		
		func session(_ session: MCSession, didFinishReceivingResourceWithName resourceName: String, fromPeer peerID: MCPeerID, at localURL: URL?, withError error: Error?) {
				
		}
		
		func browserViewControllerDidFinish(_ browserViewController: MCBrowserViewController) {
				browserViewController.dismiss(animated: true, completion: { })
		}
		
		func browserViewControllerWasCancelled(_ browserViewController: MCBrowserViewController) {
				browserViewController.dismiss(animated: true, completion: { })
		}
		
		func session(_ session: MCSession, peer peerID: MCPeerID, didChange state: MCSessionState) {
				switch state {
				case .connected:
						print("Connected: \(peerID.displayName)")
				case .connecting:
						print("Connecting: \(peerID.displayName)")
				case .notConnected:
						print("Not Connected: \(peerID.displayName)")
						
				@unknown default:
						print("Unknown state received: \(peerID.displayName)")
				}
		}
		
		func session(_ session: MCSession, didReceive data: Data, fromPeer peerID: MCPeerID) {
				//todo: Receive data
		}
}

I tried to add NSLocalNetworkUsageDescription and NSBonjourServices without any change (even if both are not mentioned in any guides except the official documentation). Sadly it didn't change anything + it seems like my XCode does not know these keys or at least do not replace the key name with another text like it did with other keys like camera permission.