Fix for KeyVault integration not working in net8.0

Author: vh-ra

2-WebApp-graph-user/2-1-Call-MSGraph/README.md

@@ -409,7 +409,7 @@ using Azure.Security.KeyVault.Secrets;
 ```CSharp
     // uncomment the following 3 lines to get ClientSecret from KeyVault
   string tenantId = Configuration.GetValue<string>("AzureAd:TenantId");
-  services.Configure<MicrosoftIdentityOptions>(
+  services.Configure<MicrosoftIdentityOptions>(OpenIdConnectDefaults.AuthenticationScheme,
         options => { options.ClientSecret = GetSecretFromKeyVault(tenantId, "ENTER_YOUR_SECRET_NAME_HERE"); });
 ```
 
@@ -428,7 +428,7 @@ using Azure.Security.KeyVault.Secrets;
 
         // uncomment the following 3 lines to get ClientSecret from KeyVault
             string tenantId = Configuration.GetValue<string>("AzureAd:TenantId");
-            services.Configure<MicrosoftIdentityOptions>(
+            services.Configure<MicrosoftIdentityOptions>(OpenIdConnectDefaults.AuthenticationScheme,
             options => { options.ClientSecret = GetSecretFromKeyVault(tenantId, "myClientSecret"); });
 
       // ... more method code continues below

2-WebApp-graph-user/2-1-Call-MSGraph/ReadmeFiles/Deployment.md

@@ -140,7 +140,7 @@ using Azure.Security.KeyVault.Secrets;
 ```CSharp
     // uncomment the following 3 lines to get ClientSecret from KeyVault
   string tenantId = Configuration.GetValue<string>("AzureAd:TenantId");
-  services.Configure<MicrosoftIdentityOptions>(
+  services.Configure<MicrosoftIdentityOptions>(OpenIdConnectDefaults.AuthenticationScheme,
         options => { options.ClientSecret = GetSecretFromKeyVault(tenantId, "ENTER_YOUR_SECRET_NAME_HERE"); });
 ```
 
@@ -159,7 +159,7 @@ using Azure.Security.KeyVault.Secrets;
 
         // uncomment the following 3 lines to get ClientSecret from KeyVault
             string tenantId = Configuration.GetValue<string>("AzureAd:TenantId");
-            services.Configure<MicrosoftIdentityOptions>(
+            services.Configure<MicrosoftIdentityOptions>(OpenIdConnectDefaults.AuthenticationScheme,
             options => { options.ClientSecret = GetSecretFromKeyVault(tenantId, "myClientSecret"); });
 
       // ... more method code continues below

2-WebApp-graph-user/2-1-Call-MSGraph/Startup.cs

@@ -37,7 +37,7 @@ public void ConfigureServices(IServiceCollection services)
 
             // uncomment the following 3 lines to get ClientSecret from KeyVault
             //string tenantId = Configuration.GetValue<string>("AzureAd:TenantId");
-            //services.Configure<MicrosoftIdentityOptions>(
+            //services.Configure<MicrosoftIdentityOptions>(OpenIdConnectDefaults.AuthenticationScheme,
             //   options => { options.ClientSecret = GetSecretFromKeyVault(tenantId, "ENTER_YOUR_SECRET_NAME_HERE"); });
 
             services.AddControllersWithViews(options =>