Thank you very much for your support. The issue was successfully resolved and I released already the first update to my app today.

Thanks for all your support. I really hope this can somehow get resolved as it‘s a very strange issue

Thanks for your investigation and suggestion. But i think step 4 and 5 were the other way round. I actually submitted my watch OS app to store so i guess i first registered it with my team. and somehow another team could register it afterwards and now it's not possible anymore for me. But i will try to change the last component of my app to something other than .watchkitapp. I thought it's mandatory to have this naming convetion from what i read on the internet. Edit: Tried to update it but Xcode is not allowing to upload to AppStoreConnect Invalid Bundle Identifier. Attempting to change bundle identifier from (myappBundleID).watchkitapp to (myappBundleID).(newName) is disallowed for bundle Sensor-App.app/Watch/Sensor-App-Watch.app. (ID: a037e632-4c6b-4337-b00a-0625e73922f4) Unfortunately I don't know which other team registered it with their account because the source code was open source but I didn't collaborate with others on it. Is it not possible for apple to delete it from the other team if it was registered due to a bug?

I have this app open source on Github. Thats a good hint. Maybe it was a mistake to do so. But ultimately i should be the first using this bundle id as my app is already in App Store. So i guess it should be tied to my team in the first place and nobody else should be able to register it.

I wasn't sure if it's a good idea to publish the bundle identifier in the forum. I created a support request with more details to the app. (Case-ID: 9822686)

.onDelete is working fine on the mac when swiping from right to left with magic mouse or trackpad. But i prefer to use a context menu and add the delete function there. var body: some View {         List {             ForEach(items) { item in                 Text("Item at \(item.timestamp!, formatter: itemFormatter)")                     .contextMenu(ContextMenu(menuItems: {                         Button(action: {                             viewContext.delete(item)                             do {                                 try viewContext.save()                             } catch {                                 let nsError = error as NSError                                 fatalError("Unresolved error \(nsError), \(nsError.userInfo)")                             }                         }, label: {                             Text("Delete")                         })                     }))             }             .onDelete(perform: deleteItems)         }         .toolbar {             #if os(iOS)             EditButton()             #endif             Button(action: addItem) {                 Label("Add Item", systemImage: "plus")             }         }     }