App Shortcut "Couldn't find AppShortcutsProvider"

I am trying to create a shortcut following "Implement App Shortcuts With App Intents" talk from WWDC2022.

The below is my MWE. In a standalone app, this can be extended and behave like the video. Adding this code to my main app, makes the shortcut show up within the Shortcuts app, but if I click on it, it pops up an alert saying

Error Domain=LNActionForAutoShortcutPhraseFetchError Code=1 "Couldn't find AppShortcutsProvider" UserInfo={NSLocalizedDescription=Couldn't find AppShortcutsProvider}

My main app has several targets, so I suppose I need to establish which one is the shortcuts provider, but I cannot find any reference to how to do this in the documents.

Via Siri, the shortcut command is not recognised at all.

import AppIntents
import SwiftUI

struct DoSomething: AppIntent {
 static var title: LocalizedStringResource = "Do something"
 func perform() async throws -> some IntentResult {
  return .result()
 }
 static var openAppWhenRun: Bool = false
}

struct MyShortcuts: AppShortcutsProvider {
 @AppShortcutsBuilder
 static var appShortcuts: [AppShortcut] {
  AppShortcut(
   intent: DoSomething(),
   phrases: ["Do Something in \(.applicationName)"],
   systemImageName: "books.vertical.fill"
  )
 }
}