Return null when failing to get access token

Author: adityapatwardhan

src/code/Microsoft.PowerShell.PSResourceGet.csproj

@@ -24,7 +24,7 @@
     <PackageReference Include="System.Net.Http" Version="4.3.4" />
     <PackageReference Include="System.Text.Json" Version="8.0.5" />
     <PackageReference Include="Microsoft.CSharp" Version="4.7.0" />
-    <PackageReference Include="Azure.Identity" Version="1.11.4" />
+    <PackageReference Include="Azure.Identity" Version="1.14.0" />
     <PackageReference Include="System.Security.Cryptography.Pkcs" Version="6.0.5" />
     <Reference Include="System.Web" />
   </ItemGroup>

src/code/Utils.cs

@@ -656,15 +656,15 @@ public static string GetAzAccessToken(PSCmdlet cmdletPassedIn)
 
             var credOptions = new DefaultAzureCredentialOptions
             {
-            ExcludeEnvironmentCredential = true,
-            ExcludeVisualStudioCodeCredential = true,
-            ExcludeVisualStudioCredential = true,
-            ExcludeWorkloadIdentityCredential = true,
-            ExcludeManagedIdentityCredential = true, // ManagedIdentityCredential makes the experience slow
-            ExcludeSharedTokenCacheCredential = true, // SharedTokenCacheCredential is not supported on macOS
-            ExcludeAzureCliCredential = false,
-            ExcludeAzurePowerShellCredential = false,
-            ExcludeInteractiveBrowserCredential = false
+                ExcludeEnvironmentCredential = true,
+                ExcludeVisualStudioCodeCredential = true,
+                ExcludeVisualStudioCredential = true,
+                ExcludeWorkloadIdentityCredential = true,
+                ExcludeManagedIdentityCredential = true, // ManagedIdentityCredential makes the experience slow
+                ExcludeSharedTokenCacheCredential = true, // SharedTokenCacheCredential is not supported on macOS
+                ExcludeAzureCliCredential = false,
+                ExcludeAzurePowerShellCredential = false,
+                ExcludeInteractiveBrowserCredential = false
             };
 
             var dCred = new DefaultAzureCredential(credOptions);
@@ -681,12 +681,12 @@ public static string GetAzAccessToken(PSCmdlet cmdletPassedIn)
             catch (OperationCanceledException)
             {
                 cmdletPassedIn.WriteWarning("Timeout occurred while acquiring Azure access token.");
-                throw;
+                return null;
             }
             catch (Exception ex)
             {
                 cmdletPassedIn.WriteWarning($"Failed to acquire Azure access token: {ex.Message}");
-                throw;
+                return null;
             }
         }