Fix Id Web build (#2991)

Co-authored-by: Franco Fung <francofung@microsoft.com>

src/Microsoft.Identity.Web.TokenAcquisition/MergedOptions.cs

@@ -222,6 +222,8 @@ internal static void UpdateMergedOptionsFromMicrosoftIdentityOptions(MicrosoftId
                     mergedOptions.AdditionalAuthorizationParameters.Add(parameter.Key, parameter.Value);
                 }
             }
+
+            mergedOptions.PushedAuthorizationBehavior = microsoftIdentityOptions.PushedAuthorizationBehavior;
 #endif
             mergedOptions.TokenValidationParameters = microsoftIdentityOptions.TokenValidationParameters.Clone();
             mergedOptions.UsePkce |= microsoftIdentityOptions.UsePkce;

src/Microsoft.Identity.Web/WebAppExtensions/MicrosoftIdentityWebAppAuthenticationBuilderExtensions.cs

@@ -544,6 +544,8 @@ internal static void PopulateOpenIdOptionsFromMergedOptions(
                     options.AdditionalAuthorizationParameters.Add(parameter.Key, parameter.Value);
                 }
             }
+
+            options.PushedAuthorizationBehavior = mergedOptions.PushedAuthorizationBehavior;
 #endif
         }
     }

tests/Microsoft.Identity.Web.Test/WebAppExtensionsTests.cs

@@ -913,7 +913,7 @@ public void PreventChangesInOpenIdConnectOptionsToBeOverlooked()
             // and diff the files to find what are the new properties.
             int numberOfProperties = typeof(OpenIdConnectOptions).GetProperties(System.Reflection.BindingFlags.Public | System.Reflection.BindingFlags.Instance).Length;
 #if NET9_0_OR_GREATER
-            int expectedNumberOfProperties = 61;
+            int expectedNumberOfProperties = 62;
             //string filePath = @"C:\temp\net9.txt";
 #elif NET8_0
             int expectedNumberOfProperties = 60;