firebase-ios-sdk: Switching from emulator to Firestore results in Unauthenticated error on device and simulator

[REQUIRED] Step 1: Describe your environment

Xcode version: 13.2.1 Firebase SDK version: Firebase (8.12.1) Installation method: SPM Firebase Component: Functions [REQUIRED] Step 2: Describe the problem

My problem is calling a callable function. Using the emulator (DEBUG) everything works fine in my iOS app. However, as soon as I switch to regular Firestore (QA) I get the following error:

Error Domain=com.firebase.functions Code=16 “UNAUTHENTICATED” UserInfo={NSLocalizedDescription=UNAUTHENTICATED}

There are no logs from the emulator when the error is returned so i am guessing the request doesn’t even reach the function. This issue seems to be related to this issue, at least I think it is. (#7783 )

Steps to reproduce:

Start emulators Start ios app with emulators configured call the callable function - this works switch from the emulator to Firestore - this does not work Actual result: fails with error: Unauthenticated.

Expected result: The callable function is executed successfully.

Relevant Code:

(Swift)

Inside AppDelegate

 func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {

#if targetEnvironment(simulator)
        let providerFactory = AppCheckDebugProviderFactory()
#else
        let providerFactory = MyAppCheckProviderFactory()
#endif
        AppCheck.setAppCheckProviderFactory(providerFactory)
        
#if DEBUG
        print("_________DEBUG___________")
        
        FirebaseApp.configure()
        let db = Firestore.firestore()
        //This is for testing
        Auth.auth().useEmulator(withHost:"localhost", port:9099)
        Functions.functions().useEmulator(withHost: "localhost", port: 5001)
        let settings = db.settings
        settings.host = "localhost:8080"
        settings.isPersistenceEnabled = false
        settings.isSSLEnabled = false
        db.settings = settings
        //This is for testing
        
        
#else
        print("__________QA______________")
        
        FirebaseApp.configure()
        let db = Firestore.firestore()
        let settings = db.settings
        settings.isPersistenceEnabled = true
        db.settings = settings

#endif        

Inside a class that uses callable functions to setup a user after anonymous signin

Functions.functions().httpsCallable("setupUser").call(dictToSubmit) { (result, error) in

Here the log that gets produced

2022-02-27 11:07:35.095163+0100 GameOn[67751:5263840] 8.12.1 - [Firebase/Auth][I-AUT000002] Token auto-refresh enabled.
2022-02-27 11:07:35.095841+0100 GameOn[67751:5263840] 8.12.1 - [Firebase/Auth][I-AUT000004] Token auto-refresh scheduled in 55:00 for the new token.
2022-02-27 11:07:35.096272+0100 GameOn[67751:5263840] 8.12.1 - [Firebase/Auth][I-AUT000017] Has valid access token. Estimated expiration date: 2022-02-27 11:07:34 +0000, current date: 2022-02-27 10:07:35 +0000
2022-02-27 11:07:35.177849+0100 GameOn[67751:5263857] [boringssl] boringssl_metrics_log_metric_block_invoke(151) Failed to log metrics
Something went wrong: Error Domain=com.firebase.functions Code=16 "UNAUTHENTICATED" UserInfo={NSLocalizedDescription=UNAUTHENTICATED}