diff --git a/packages/account-sdk/src/interface/public-utilities/spend-permission/utils.ts b/packages/account-sdk/src/interface/public-utilities/spend-permission/utils.ts
index eaf7fe31..2ad81365 100644
--- a/packages/account-sdk/src/interface/public-utilities/spend-permission/utils.ts
+++ b/packages/account-sdk/src/interface/public-utilities/spend-permission/utils.ts
@@ -124,9 +124,8 @@ export function createSpendPermissionTypedDataWithSeconds(
 
   // Runtime check to prevent misuse
   if (process.env.NODE_ENV === 'production') {
-    console.warn(
-      '⚠️ createSpendPermissionTypedDataWithSeconds is being used. ' +
-        'This function is intended for testing purposes only.'
+    throw new Error(
+      'createSpendPermissionTypedDataWithSeconds is for testing only and must not be called in production.'
     );
   }
 
diff --git a/packages/account-sdk/src/sign/base-account/Signer.ts b/packages/account-sdk/src/sign/base-account/Signer.ts
index 1cffe605..58ee5ad2 100644
--- a/packages/account-sdk/src/sign/base-account/Signer.ts
+++ b/packages/account-sdk/src/sign/base-account/Signer.ts
@@ -792,7 +792,7 @@ export class Signer {
           correlationId,
           errorMessage: parseErrorMessageFromAny(error),
         });
-        return standardErrors.provider.unauthorized(
+        throw standardErrors.provider.unauthorized(
           'failed to add sub account owner when sending request to sub account signer'
         );
       }