diff --git a/src/Microsoft.Agents.A365.DevTools.Cli/Services/AzureAuthValidator.cs b/src/Microsoft.Agents.A365.DevTools.Cli/Services/AzureAuthValidator.cs
index eef2e29..6c252b0 100644
--- a/src/Microsoft.Agents.A365.DevTools.Cli/Services/AzureAuthValidator.cs
+++ b/src/Microsoft.Agents.A365.DevTools.Cli/Services/AzureAuthValidator.cs
@@ -3,6 +3,7 @@
 
 using System.Text.Json;
 using Microsoft.Extensions.Logging;
+using Microsoft.Agents.A365.DevTools.Cli.Services.Helpers;
 
 namespace Microsoft.Agents.A365.DevTools.Cli.Services;
 
@@ -47,8 +48,9 @@ public async Task<bool> ValidateAuthenticationAsync(string? expectedSubscription
                 return false;
             }
 
-            // Parse the account information
-            var accountJson = JsonDocument.Parse(result.StandardOutput);
+            // Clean and parse the account information
+            var cleanedOutput = JsonDeserializationHelper.CleanAzureCliJsonOutput(result.StandardOutput);
+            var accountJson = JsonDocument.Parse(cleanedOutput);
             var root = accountJson.RootElement;
 
             var subscriptionId = root.GetProperty("id").GetString() ?? string.Empty;
diff --git a/src/Microsoft.Agents.A365.DevTools.Cli/Services/AzureCliService.cs b/src/Microsoft.Agents.A365.DevTools.Cli/Services/AzureCliService.cs
index fa5e473..4651c16 100644
--- a/src/Microsoft.Agents.A365.DevTools.Cli/Services/AzureCliService.cs
+++ b/src/Microsoft.Agents.A365.DevTools.Cli/Services/AzureCliService.cs
@@ -4,6 +4,7 @@
 using System.Text.Json;
 using Microsoft.Extensions.Logging;
 using Microsoft.Agents.A365.DevTools.Cli.Models;
+using Microsoft.Agents.A365.DevTools.Cli.Services.Helpers;
 
 namespace Microsoft.Agents.A365.DevTools.Cli.Services;
 
@@ -51,7 +52,15 @@ public async Task<bool> IsLoggedInAsync()
                 return null;
             }
 
-            var accountJson = JsonSerializer.Deserialize<JsonElement>(result.StandardOutput);
+            var cleanedOutput = JsonDeserializationHelper.CleanAzureCliJsonOutput(result.StandardOutput);
+            
+            if (string.IsNullOrWhiteSpace(cleanedOutput))
+            {
+                _logger.LogError("Azure CLI returned empty output");
+                return null;
+            }
+
+            var accountJson = JsonSerializer.Deserialize<JsonElement>(cleanedOutput);
             
             return new AzureAccountInfo
             {
@@ -89,7 +98,13 @@ public async Task<List<AzureResourceGroup>> ListResourceGroupsAsync()
                 return new List<AzureResourceGroup>();
             }
 
-            var resourceGroupsJson = JsonSerializer.Deserialize<JsonElement[]>(result.StandardOutput);
+            var cleanedOutput = JsonDeserializationHelper.CleanAzureCliJsonOutput(result.StandardOutput);
+            if (string.IsNullOrWhiteSpace(cleanedOutput))
+            {
+                return new List<AzureResourceGroup>();
+            }
+
+            var resourceGroupsJson = JsonSerializer.Deserialize<JsonElement[]>(cleanedOutput);
             
             return resourceGroupsJson?.Select(rg => new AzureResourceGroup
             {
@@ -120,7 +135,13 @@ public async Task<List<AzureAppServicePlan>> ListAppServicePlansAsync()
                 return new List<AzureAppServicePlan>();
             }
 
-            var plansJson = JsonSerializer.Deserialize<JsonElement[]>(result.StandardOutput);
+            var cleanedOutput = JsonDeserializationHelper.CleanAzureCliJsonOutput(result.StandardOutput);
+            if (string.IsNullOrWhiteSpace(cleanedOutput))
+            {
+                return new List<AzureAppServicePlan>();
+            }
+
+            var plansJson = JsonSerializer.Deserialize<JsonElement[]>(cleanedOutput);
             
             return plansJson?.Select(plan => new AzureAppServicePlan
             {
@@ -153,7 +174,13 @@ public async Task<List<AzureLocation>> ListLocationsAsync()
                 return new List<AzureLocation>();
             }
 
-            var locationsJson = JsonSerializer.Deserialize<JsonElement[]>(result.StandardOutput);
+            var cleanedOutput = JsonDeserializationHelper.CleanAzureCliJsonOutput(result.StandardOutput);
+            if (string.IsNullOrWhiteSpace(cleanedOutput))
+            {
+                return new List<AzureLocation>();
+            }
+
+            var locationsJson = JsonSerializer.Deserialize<JsonElement[]>(cleanedOutput);
             
             return locationsJson?.Select(loc => new AzureLocation
             {
@@ -170,4 +197,4 @@ public async Task<List<AzureLocation>> ListLocationsAsync()
             return new List<AzureLocation>();
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/Microsoft.Agents.A365.DevTools.Cli/Services/BotConfigurator.cs b/src/Microsoft.Agents.A365.DevTools.Cli/Services/BotConfigurator.cs
index 1989eff..a2b098b 100644
--- a/src/Microsoft.Agents.A365.DevTools.Cli/Services/BotConfigurator.cs
+++ b/src/Microsoft.Agents.A365.DevTools.Cli/Services/BotConfigurator.cs
@@ -63,7 +63,8 @@ public async Task<bool> CreateEndpointWithAgentBlueprintAsync(
                 return false;
             }
 
-            var subscriptionInfo = JsonSerializer.Deserialize<JsonElement>(subscriptionResult.StandardOutput);
+            var cleanedOutput = JsonDeserializationHelper.CleanAzureCliJsonOutput(subscriptionResult.StandardOutput);
+            var subscriptionInfo = JsonSerializer.Deserialize<JsonElement>(cleanedOutput);
             var tenantId = subscriptionInfo.GetProperty("tenantId").GetString();
 
             if (string.IsNullOrEmpty(tenantId))
@@ -181,7 +182,8 @@ public async Task<bool> DeleteEndpointWithAgentBlueprintAsync(
                 return false;
             }
 
-            var subscriptionInfo = JsonSerializer.Deserialize<JsonElement>(subscriptionResult.StandardOutput);
+            var cleanedOutput = JsonDeserializationHelper.CleanAzureCliJsonOutput(subscriptionResult.StandardOutput);
+            var subscriptionInfo = JsonSerializer.Deserialize<JsonElement>(cleanedOutput);
             var tenantId = subscriptionInfo.GetProperty("tenantId").GetString();
 
             if (string.IsNullOrEmpty(tenantId))
diff --git a/src/Microsoft.Agents.A365.DevTools.Cli/Services/Helpers/JsonDeserializationHelper.cs b/src/Microsoft.Agents.A365.DevTools.Cli/Services/Helpers/JsonDeserializationHelper.cs
index e685799..fb712df 100644
--- a/src/Microsoft.Agents.A365.DevTools.Cli/Services/Helpers/JsonDeserializationHelper.cs
+++ b/src/Microsoft.Agents.A365.DevTools.Cli/Services/Helpers/JsonDeserializationHelper.cs
@@ -63,4 +63,42 @@ public static class JsonDeserializationHelper
             return null;
         }
     }
+
+    /// <summary>
+    /// Cleans JSON output from Azure CLI by removing control characters and non-JSON content.
+    /// Azure CLI on Windows can output control characters (like 0x0C - form feed) and warning messages
+    /// that need to be stripped before JSON parsing.
+    /// </summary>
+    /// <param name="output">The raw output from Azure CLI</param>
+    /// <returns>Cleaned JSON string ready for parsing</returns>
+    public static string CleanAzureCliJsonOutput(string output)
+    {
+        if (string.IsNullOrWhiteSpace(output))
+        {
+            return string.Empty;
+        }
+
+        // Remove control characters (0x00-0x1F except \r, \n, \t)
+        // These characters can appear in Azure CLI output on Windows
+        var cleaned = new System.Text.StringBuilder(output.Length);
+        foreach (char c in output)
+        {
+            if (c >= 32 || c == '\n' || c == '\r' || c == '\t')
+            {
+                cleaned.Append(c);
+            }
+        }
+
+        var result = cleaned.ToString().Trim();
+        
+        // Find the first { or [ to locate JSON start
+        // This handles cases where Azure CLI outputs warnings or other text before the JSON
+        int jsonStart = result.IndexOfAny(new[] { '{', '[' });
+        if (jsonStart > 0)
+        {
+            result = result.Substring(jsonStart);
+        }
+
+        return result;
+    }
 }