diff --git a/errors/v1/msg.proto b/errors/v1/msg.proto
index 16cd37d..f4e9895 100644
--- a/errors/v1/msg.proto
+++ b/errors/v1/msg.proto
@@ -39,6 +39,7 @@ enum ErrCode {
   INVALID_BUY_AMOUNT = 2015;
   INVALID_BUY_AMOUNT_MAX = 2016;
   INVALID_BUY_AMOUNT_MIN = 2017;
+  INVALID_ARGUMENT_TFA_REQUIRED = 2018;
 
   // Resource errors
   NOT_FOUND = 3000;