Erich/fix write object error

src/Accounts/Accounts/Account/ConnectAzureRmAccount.cs

@@ -404,7 +404,7 @@ public override void ExecuteCmdlet()
                         subscriptionName,
                         password,
                         SkipValidation,
-                        WriteWarning,
+                        WriteWarningEvent, //Could not use WriteWarning directly because it may be in worker thread
                         name,
                         shouldPopulateContextList,
                         MaxContextPopulation));
@@ -419,7 +419,7 @@ public override void ExecuteCmdlet()
 
                    try
                    {
-                       var result = (PSAzureProfile)(task.ConfigureAwait(false).GetAwaiter().GetResult());
+                       var result = (PSAzureProfile)task.Result;
                        WriteObject(result);
                    }
                    catch (AuthenticationFailedException ex)

src/Accounts/Accounts/ChangeLog.md

@@ -18,6 +18,7 @@
         - Additional information about change #1
 -->
 ## Upcoming Release
+* Fixed an issue causing Write-Object error during Connect-AzAccount [#13419]
 * Added parameter "ContainerRegistryEndpointSuffix" to: `Add-AzEnvironment`, `Set-AzEnvironment` 
 * Supported interrupting login by hitting <kbd>CTRL</kbd>+<kbd>C</kbd>
 * Fixed an issue causing `Connect-AzAccount -KeyVaultAccessToken` not working [#13127]

src/Accounts/Authentication/Factories/AuthenticationFactory.cs

@@ -123,7 +123,7 @@ public IAccessToken Authenticate(
                 {
                     while (processAuthenticator != null && processAuthenticator.TryAuthenticate(GetAuthenticationParameters(tokenCacheProvider, account, environment, tenant, password, promptBehavior, promptAction, tokenCache, resourceId), out authToken))
                     {
-                        token = authToken?.ConfigureAwait(true).GetAwaiter().GetResult();
+                        token = authToken?.ConfigureAwait(false).GetAwaiter().GetResult();
                         if (token != null)
                         {
                             // token.UserId is null when getting tenant token in ADFS environment
@@ -142,7 +142,7 @@ public IAccessToken Authenticate(
                 {
                     if (!IsTransientException(e) || retries == 0)
                     {
-                        throw e;
+                        throw;
                     }
 
                     TracingAdapter.Information(string.Format("[AuthenticationFactory] Exception caught when calling TryAuthenticate, retrying authentication - Exception message: '{0}'", e.Message));

src/Accounts/Authenticators/DeviceCodeAuthenticator.cs

@@ -21,6 +21,7 @@
 
 using Microsoft.Azure.Commands.Common.Authentication;
 using Microsoft.Azure.Commands.Common.Authentication.Abstractions;
+using Microsoft.Azure.Commands.ResourceManager.Common;
 
 namespace Microsoft.Azure.PowerShell.Authenticators
 {
@@ -74,7 +75,7 @@ public override bool CanAuthenticate(AuthenticationParameters parameters)
         private void WriteWarning(string message)
         {
             EventHandler<StreamEventArgs> writeWarningEvent;
-            if (AzureSession.Instance.TryGetComponent("WriteWarning", out writeWarningEvent))
+            if (AzureSession.Instance.TryGetComponent(AzureRMCmdlet.WriteWarningKey, out writeWarningEvent))
             {
                 writeWarningEvent(this, new StreamEventArgs() { Message = message });
             }

src/Accounts/Authenticators/MsalAccessToken.cs

@@ -73,7 +73,7 @@ public static async Task<IAccessToken> GetAccessTokenAsync(
             string userId = null,
             string homeAccountId = "")
         {
-            var token = await tokenCredential.GetTokenAsync(requestContext, cancellationToken);
+            var token = await tokenCredential.GetTokenAsync(requestContext, cancellationToken).ConfigureAwait(false);
             return new MsalAccessToken(tokenCredential, requestContext, token.Token, token.ExpiresOn, tenantId, userId, homeAccountId);
         }
 
@@ -84,9 +84,9 @@ public static async Task<IAccessToken> GetAccessTokenAsync(
             TokenRequestContext requestContext,
             CancellationToken cancellationToken)
         {
-            var record = await authTask;
+            var record = await authTask.ConfigureAwait(false);
             cancellationToken.ThrowIfCancellationRequested();
-            var token = await tokenCredential.GetTokenAsync(requestContext, cancellationToken);
+            var token = await tokenCredential.GetTokenAsync(requestContext, cancellationToken).ConfigureAwait(false);
 
             return new MsalAccessToken(tokenCredential, requestContext, token.Token, token.ExpiresOn, record.TenantId, record.Username, record.HomeAccountId);
         }