Null reference on iOS AcquireTokenAsync(Scopes, UIParent)

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name: Bug report about: Create a report to help us improve

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Which Version of MSAL are you using ? MSAL 2.2.1-preview AND MSAL 2.3.1

Which platform has the issue? xamarin iOS

What authentication flow has the issue?

• Mobile
  • [X ] Xamarin.iOS

What is the identity provider ?

• Azure AD
• [ X] Azure AD B2C

If B2C, what social identity did you use? Microsoft Account

Repro

result = await _pca.AcquireTokenAsync(AuthConstants.Scopes, _uiParent);

Expected behavior After a login on the webview I should be navigated back to the application and my token should be stored.

Actual behavior After the webview is closed the application is exitting with an null reference exception.

Additional context/ Logs / Screenshots

at Foundation.NSString…ctor (System.String str) [0x00009] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/Foundation/NSString.cs:139 at Foundation.NSData.FromString (System.String s, Foundation.NSStringEncoding encoding) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/Foundation/NSData.cs:208 at Foundation.NSData.op_Implicit (System.String s) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/Foundation/NSData.cs:214 at Microsoft.Identity.Core.iOSTokenCacheAccessor.CreateRecord (System.String account, System.String service, System.String generic, System.Int32 type, System.String value) [0x00014] in <420cc22f37f340a0a560df4a374dbe4a>:0 at Microsoft.Identity.Core.iOSTokenCacheAccessor.Save (System.String account, System.String service, System.String generic, System.Int32 type, System.String value) [0x00000] in <420cc22f37f340a0a560df4a374dbe4a>:0 at Microsoft.Identity.Core.iOSTokenCacheAccessor.SaveAccount (Microsoft.Identity.Core.Cache.MsalAccountCacheItem item) [0x00033] in <420cc22f37f340a0a560df4a374dbe4a>:0 at Microsoft.Identity.Core.Telemetry.TelemetryTokenCacheAccessor.SaveAccount (Microsoft.Identity.Core.Cache.MsalAccountCacheItem item) [0x00000] in <420cc22f37f340a0a560df4a374dbe4a>:0 at Microsoft.Identity.Core.Telemetry.TelemetryTokenCacheAccessor.SaveAccount (Microsoft.Identity.Core.Cache.MsalAccountCacheItem item, Microsoft.Identity.Core.RequestContext requestContext) [0x0001f] in <420cc22f37f340a0a560df4a374dbe4a>:0 at Microsoft.Identity.Client.TokenCache.SaveAccessAndRefreshToken (Microsoft.Identity.Client.Internal.Requests.AuthenticationRequestParameters requestParams, Microsoft.Identity.Core.OAuth2.MsalTokenResponse response) [0x00178] in <420cc22f37f340a0a560df4a374dbe4a>:0 at Microsoft.Identity.Client.Internal.Requests.RequestBase.CacheTokenResponseAndCreateAuthenticationResult (Microsoft.Identity.Core.OAuth2.MsalTokenResponse msalTokenResponse) [0x00181] in <420cc22f37f340a0a560df4a374dbe4a>:0 at Microsoft.Identity.Client.Internal.Requests.InteractiveRequest+<ExecuteAsync>d__9.MoveNext () [0x00168] in <420cc22f37f340a0a560df4a374dbe4a>:0 — End of stack trace from previous location where exception was thrown — at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 at System.Runtime.CompilerServices.ConfiguredTaskAwaitable1+ConfiguredTaskAwaiter[TResult].GetResult () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:535 at Microsoft.Identity.Client.Internal.Requests.RequestBase+<RunAsync>d__18.MoveNext () [0x0016b] in <420cc22f37f340a0a560df4a374dbe4a>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 at System.Runtime.CompilerServices.ConfiguredTaskAwaitable1+ConfiguredTaskAwaiter[TResult].GetResult () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:535 at Microsoft.Identity.Client.PublicClientApplication+<AcquireTokenForLoginHintCommonAsync>d__23.MoveNext () [0x00106] in <420cc22f37f340a0a560df4a374dbe4a>:0 — End of stack trace from previous location where exception was thrown — at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 at System.Runtime.CompilerServices.ConfiguredTaskAwaitable1+ConfiguredTaskAwaiter[TResult].GetResult () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:535 at Microsoft.Identity.Client.PublicClientApplication+<AcquireTokenAsync>d__15.MoveNext () [0x0009b] in <420cc22f37f340a0a560df4a374dbe4a>:0 --- End of stack trace from previous location where exception was thrown --- at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 at System.Runtime.CompilerServices.TaskAwaiter1[TResult].GetResult () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:357 at MyAppMobile.Services.AuthenticationService+<GetAccessToken>d__5.MoveNext () [0x001ee] in /Users/vcs12345/Documents/GIT/MyApp-Mobile/MyAppMobile/MyAppMobile/Services/AuthenticationService.cs:64 — End of stack trace from previous location where exception was thrown — at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess (System.Threading.Tasks.Task task) [0x00037] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:187 at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification (System.Threading.Tasks.Task task) [0x00028] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:156 at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd (System.Threading.Tasks.Task task) [0x00008] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:128 at System.Runtime.CompilerServices.TaskAwaiter`1[TResult].GetResult () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/TaskAwaiter.cs:357 at MyAppMobile.ViewModels.LoginViewModel+<StartLoginProcess>d__11.MoveNext () [0x0005f] in /Users/vcs12345/Documents/GIT/MyApp-Mobile/MyAppMobile/MyAppMobile/ViewModels/LoginViewModel.cs:71 — End of stack trace from previous location where exception was thrown — at System.Runtime.CompilerServices.AsyncMethodBuilderCore+<>c.<ThrowAsync>b__6_0 (System.Object state) [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1018 at Foundation.NSAsyncSynchronizationContextDispatcher.Apply () [0x00000] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/Foundation/NSAction.cs:178 — End of stack trace from previous location where exception was thrown — at (wrapper managed-to-native) UIKit.UIApplication.UIApplicationMain(int,string[],intptr,intptr) at UIKit.UIApplication.Main (System.String[] args, System.IntPtr principal, System.IntPtr delegate) [0x00005] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/UIKit/UIApplication.cs:79 at UIKit.UIApplication.Main (System.String[] args, System.String principalClassName, System.String delegateClassName) [0x0002c] in /Library/Frameworks/Xamarin.iOS.framework/Versions/12.0.0.15/src/Xamarin.iOS/UIKit/UIApplication.cs:63 at MyAppMobile.iOS.Application.Main (System.String[] args) [0x00001] in /Users/vcs12345/Documents/GIT/MyApp-Mobile/MyAppMobile/MyAppMobile.iOS/Main.cs:17

[Bloodyairtimer]

@Bloodyairtimer did your issue get resolved?

Yes, adding the User’s Object ID to the claim resolved my issue. Issue can be closed.

[jennyf19]

@Bloodyairtimer did your issue get resolved?