MSAL not working with MacOS26

[cconner100]

Current behavior 🐛

I get the following exception when running with .net 10 and macos 26
Exception has occurred: CLR/System.PlatformNotSupportedException
An exception of type 'System.PlatformNotSupportedException' occurred in System.Private.CoreLib.dll but was not handled in user code: 'macOS 26.1.0'
at Microsoft.Identity.Client.Platforms.netstandard.NetCorePlatformProxy.StartDefaultOsBrowserAsync(String url, Boolean isBrokerConfigured)
at Microsoft.Identity.Client.Platforms.Shared.Desktop.OsBrowser.DefaultOsBrowserWebUi.<>c__DisplayClass10_0.b__0(Uri u)
at Microsoft.Identity.Client.Platforms.Shared.Desktop.OsBrowser.DefaultOsBrowserWebUi.d__10.MoveNext()
at Microsoft.Identity.Client.Platforms.Shared.Desktop.OsBrowser.DefaultOsBrowserWebUi.d__7.MoveNext()
at Microsoft.Identity.Client.Internal.AuthCodeRequestComponent.d__7.MoveNext()
at Microsoft.Identity.Client.Internal.AuthCodeRequestComponent.d__4.MoveNext()
at Microsoft.Identity.Client.Internal.Requests.InteractiveRequest.d__11.MoveNext()
at Microsoft.Identity.Client.Internal.Requests.InteractiveRequest.d__9.MoveNext()
at Microsoft.Identity.Client.Internal.Requests.RequestBase.<>c__DisplayClass11_1.<b__1>d.MoveNext()
at Microsoft.Identity.Client.Utils.StopwatchService.d__4.MoveNext()
at Microsoft.Identity.Client.Internal.Requests.RequestBase.d__11.MoveNext()
at Microsoft.Identity.Client.ApiConfig.Executors.PublicClientExecutor.d__2.MoveNext()
at ZtClientFramework.ZtAuthenticationService.d__17.MoveNext() in /Users/curtisconner/ZiiDMS-NextGen/Framework/Client/ZtClientFramework/Service/ZtAuthenticationService.cs:line 164
at ZtClientFramework.ZtAuthenticationService.d__17.MoveNext() in /Users/curtisconner/ZiiDMS-NextGen/Framework/Client/ZtClientFramework/Service/ZtAuthenticationService.cs:line 227
at ZtClientFramework.ZtAuthenticationService.d__16.MoveNext() in /Users/curtisconner/ZiiDMS-NextGen/Framework/Client/ZtClientFramework/Service/ZtAuthenticationService.cs:line 149
at ZiiDMSClientCommon.B2CLoginViewModel.d__20.MoveNext() in /Users/curtisconner/ZiiDMS-NextGen/Client/Common/ZiiDMSClientCommon/Views/B2CLoginViewModel.cs:line 100
at ZiiDMSClientCommon.B2CLogin.d__9.MoveNext() in /Users/curtisconner/ZiiDMS-NextGen/Client/Common/ZiiDMSClientCommon/Views/B2CLogin.xaml.cs:line 51
at ZiiDMSClientCommon.B2CLogin.d__8.MoveNext() in /Users/curtisconner/ZiiDMS-NextGen/Client/Common/ZiiDMSClientCommon/Views/B2CLogin.xaml.cs:line 37

Any ideas or workarounds for this?

Seems like it cant start the browser for some reason

Expected behavior 🎯

should open the browser for the login

How to reproduce it (as minimally and precisely as possible) 🔬

No response

Workaround 🛠️

none

Renderer 🎨

• Skia
• Native

Affected platforms 📱💻🖥️

Desktop (macOS)

Uno.Sdk version (and other relevant versions) 📦

6.4

IDE version 🧑‍💻

No response

Anything else we need to know? 💬

No response

[ajpinedam]

Hi @cconner100 , at the moment the Desktop target (all the OSs) do not support MSAL authentication.

This is the GH issue that tracks the progress of this change/feature: unoplatform/uno.extensions#2640

[cricketthomas]

This seems to be an MSAL and .net 10 issue. My console apps are breaking on .net 10 in macOS that work fine with .net 9.

AzureAD/microsoft-authentication-library-for-dotnet#5541