diff --git a/Source/ProofOfConcept/Program.cs b/Source/ProofOfConcept/Program.cs
index 1823b8b..18bf0c0 100644
--- a/Source/ProofOfConcept/Program.cs
+++ b/Source/ProofOfConcept/Program.cs
@@ -56,6 +56,7 @@ builder.Services.AddAuthentication(o =>
     // This must match exactly what you register at Tesla
     o.CallbackPath = new PathString("/token-exchange");
 
+    o.TokenValidationParameters.ValidateIssuer = false;
     o.TokenValidationParameters.ValidIssuers = ["https://fleet-auth.tesla.com/oauth2/v3/nts", "https://auth.tesla.com/oauth2/v3", "https://fleet-auth.prd.vn.cloud.tesla.com/oauth2/v3/nts"];
     
     // Scopes you actually need