/errors/customer_error.proto 

--- v18/errors/customer_error.proto 2025-08-05 14:36:12.000000000 +0000
+++ v19/errors/customer_error.proto 2025-08-05 14:36:15.000000000 +0000
@@ -42,5 +42,11 @@

     // CustomerService cannot get a customer that has not been fully set up.
     ACCOUNT_NOT_SET_UP = 3;
+
+    // Customer creation is denied for policy violation.
+    CREATION_DENIED_FOR_POLICY_VIOLATION = 4;
+
+    // Manager account is ineligible to create new accounts.
+    CREATION_DENIED_INELIGIBLE_MCC = 5;
   }
 }