Mac Catalyst app won't launch in Xcode

I'm building an app for deployment on iPhone, iPad and Mac Catalyst. I am using Automatic Code Signing. Project build without a single warning of any kind... Debugging and running the app on both iPhone and iPad is working fine both in the simulators as well as on various test devices.

I have now turned to debugging on my Mac (M1Pro-MBP). I have run Clean many times....When I set the run destination to My Mac Catalyst and run I immediately see a dialog stating:

"The LaunchServices launcher has returned an error. Please check the system logs for the underlying cause of the error."

There is button to reveal details. Those details are shown below.

At the moment I am under the impression that this must be a relatively straightforward configuration issue which I have overlooked....

The app does contain an action and if I build and run only the action with Mac Catalyst as the destination it runs fine.. I only hit the error when I try to run the container app with embedded action with my Mac as the run destination....

Can anyone shed any light on this matter? All thoughts appreciated!

Steve

Domain: IDELaunchErrorDomain
Code: 20
Recovery Suggestion: The LaunchServices launcher has returned an error. Please check the system logs for the underlying cause of the error.
User Info: {
    DVTErrorCreationDateKey = "2023-07-19 14:36:14 +0000";
    DVTRadarComponentKey = 968756;
    IDERunOperationFailingWorker = IDELaunchServicesLauncher;
}
--
The operation couldn’t be completed. Launch failed.
Domain: RBSRequestErrorDomain
Code: 5
Failure Reason: Launch failed.
--
Launchd job spawn failed
Domain: NSPOSIXErrorDomain
Code: 153
--

Analytics Event: com.apple.dt.IDERunOperationWorkerFinished : {
    "device_model" = "MacBookPro18,3";
    "device_osBuild" = "13.4.1 (22F82)";
    "device_platform" = "com.apple.platform.macosx";
    "launchSession_schemeCommand" = Run;
    "launchSession_state" = 1;
    "launchSession_targetArch" = arm64;
    "operation_duration_ms" = 172;
    "operation_errorCode" = 20;
    "operation_errorDomain" = IDELaunchErrorDomain;
    "operation_errorWorker" = IDELaunchServicesLauncher;
    "operation_name" = IDERunOperationWorkerGroup;
    "param_consoleMode" = 0;
    "param_debugger_attachToExtensions" = 0;
    "param_debugger_attachToXPC" = 1;
    "param_debugger_type" = 3;
    "param_destination_isProxy" = 0;
    "param_destination_platform" = "com.apple.platform.macosx";
    "param_diag_MainThreadChecker_stopOnIssue" = 0;
    "param_diag_MallocStackLogging_enableDuringAttach" = 0;
    "param_diag_MallocStackLogging_enableForXPC" = 1;
    "param_diag_allowLocationSimulation" = 1;
    "param_diag_checker_tpc_enable" = 1;
    "param_diag_gpu_frameCapture_enable" = 0;
    "param_diag_gpu_shaderValidation_enable" = 0;
    "param_diag_gpu_validation_enable" = 0;
    "param_diag_memoryGraphOnResourceException" = 0;
    "param_diag_queueDebugging_enable" = 1;
    "param_diag_runtimeProfile_generate" = 0;
    "param_diag_sanitizer_asan_enable" = 0;
    "param_diag_sanitizer_tsan_enable" = 0;
    "param_diag_sanitizer_tsan_stopOnIssue" = 0;
    "param_diag_sanitizer_ubsan_stopOnIssue" = 0;
    "param_diag_showNonLocalizedStrings" = 0;
    "param_diag_viewDebugging_enabled" = 1;
    "param_diag_viewDebugging_insertDylibOnLaunch" = 1;
    "param_install_style" = 0;
    "param_launcher_UID" = 2;
    "param_launcher_allowDeviceSensorReplayData" = 0;
    "param_launcher_kind" = 0;
    "param_launcher_style" = 99;
    "param_launcher_substyle" = 8192;
    "param_runnable_appExtensionHostRunMode" = 0;
    "param_runnable_productType" = "com.apple.product-type.application";
    "param_testing_launchedForTesting" = 0;
    "param_testing_suppressSimulatorApp" = 0;
    "param_testing_usingCLI" = 0;
    "sdk_canonicalName" = "macosx13.3";
    "sdk_osVersion" = "13.3";
    "sdk_variant" = iosmac;
}
--


System Information

macOS Version 13.4.1 (c) (Build 22F770820d)
Xcode 14.3.1 (21815) (Build 14E300c)
Timestamp: 2023-07-19T08:36:14-06:00