I have written some cloud functions and deployed them. Initially, I was using a single function onUpdate, and it's working fine. Today I've created a simple onCall function that I'm willing to call from iOS Firebase SDK. this is the test function that I'm assuming to work but it is giving me Unauthenticated error in the response.

exports.test = functions.https.onCall((data, context) => {
  console.log('test call info', data, context);
  return 'hello, world!';
});

When I check the logs on firebase, it is showing me the below logs -

Can anybody help me in resolving this issue? Few key points -

• I've not enabled App Check.
• I'm able to access Firebase real-time DB and Firestore DB from the iOS app and from internal cloud functions (onUpdate), just facing this issue with HTTP callable functions.

Here is the iOS app code where I'm calling the cloud function -

   let functions = Functions.functions()
   functions.httpsCallable("test").call() { res, error in
        if let error = error {
            debugPrint(error)
        } else {
            debugPrint(res?.data)
        }
   }

Thanks