diff --git a/Source/ProofOfConcept/Program.cs b/Source/ProofOfConcept/Program.cs
index eb14095..7984596 100644
--- a/Source/ProofOfConcept/Program.cs
+++ b/Source/ProofOfConcept/Program.cs
@@ -113,7 +113,7 @@ builder.Services
         o.AdditionalAuthorizationParameters.Add("prompt_missing_scopes", "true");
 
         o.TokenValidationParameters.ValidateIssuer = true;
-        o.TokenValidationParameters.ValidIssuer = o.Authority;
+        o.TokenValidationParameters.ValidIssuer = "https://fleet-auth.tesla.com/oauth2/v3/nts";
         
         // ✅ Add the Fleet API audience to the token POST
         const string FleetApiAudience = "https://fleet-api.prd.eu.vn.cloud.tesla.com"; // set your region base