Fix MSAL COM interop exception by forcing system browser authentication

[Copilot]

MSAL 4.56.0's embedded WebBrowser authentication throws ArgumentException: ObjectForScripting's class must be visible to COM when connecting to Power Automate API via OAuth.

Changes

• Configure AcquireTokenInteractive to use system browser instead of embedded WebView

authResult = await app
    .AcquireTokenInteractive(scopes)
    .WithTenantId(tenantId)
    .WithUseEmbeddedWebView(false)  // Added
    .ExecuteAsync();

This avoids MSAL's internal COM interop requirements while providing standard browser-based OAuth flow.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>'Unhandled exception' error after clicking Connect to Power Automate API</issue_title>
<issue_description>FEH ver: 1.2025.10.2
XRMToolBox ver: 1.2025.10.73

Updated to the latest versions of XRMTB and FEH yesterday and am now getting the following error after clicking Connect to Power Automate API:

I am connected to the environment using OAuth.

Full error text:

See the end of this message for details on invoking 
just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************
System.ArgumentException: ObjectForScripting's class must be visible to COM.  Verify that the object is public, or consider adding the ComVisible attribute to your class.
   at System.Windows.Forms.WebBrowser.set_ObjectForScripting(Object value)
   at Microsoft.Identity.Client.Platforms.Features.WinFormsLegacyWebUi.InteractiveWebUI.OnAuthenticate(CancellationToken cancellationToken)
   at Microsoft.Identity.Client.Platforms.Features.WinFormsLegacyWebUi.WebUI.<>c__DisplayClass20_0.<AcquireAuthorizationAsync>b__0()
   at Microsoft.Identity.Client.Platforms.Features.WinFormsLegacyWebUi.WebUI.<AcquireAuthorizationAsync>d__20.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.Identity.Client.Internal.AuthCodeRequestComponent.<FetchAuthCodeAndPkceInternalAsync>d__7.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.Identity.Client.Internal.AuthCodeRequestComponent.<FetchAuthCodeAndPkceVerifierAsync>d__4.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.Identity.Client.Internal.Requests.InteractiveRequest.<GetTokenResponseAsync>d__11.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.Identity.Client.Internal.Requests.InteractiveRequest.<ExecuteAsync>d__9.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.Identity.Client.Internal.Requests.RequestBase.<RunAsync>d__12.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.Identity.Client.ApiConfig.Executors.PublicClientExecutor.<ExecuteAsync>d__2.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Fic.XTB.FlowExecutionHistory.FlowExecutionHistory.<tsbConnectPowerAutomateApi_Click>d__49.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()


************** Loaded Assemblies **************
mscorlib
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.9310.0 built by: NET481REL1LAST_C
    CodeBase: file:///C:/Windows/Microsoft.NET/Framework64/v4.0.30319/mscorlib.dll
----------------------------------------
XrmToolBox
    Assembly Version: 1.2025.10.73
    Win32 Version: 1.2025.10.73
    CodeBase: file:///C:/ProgramData/XRMToolbox/XrmToolBox.exe
----------------------------------------
XrmToolBox.Extensibility
    Assembly Version: 1.2025.7.71
    Win32 Version: 1.2025.7.71
    CodeBase: file:///C:/ProgramData/XRMToolbox/XrmToolBox.Extensibility.DLL
----------------------------------------
System.Windows.Forms
    Assembly Version: 4.0.0.0
    Win32 Version: 4.8.9251.0 built by: NET481REL1LAST_C
    CodeBase: file:///C:/Windows/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
System
    Assembly Version: 4.0.0.0
    Win32 ...

</details>



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- Fixes DynamicsNinja/FlowExecutionHistory#46

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