diff --git a/errormessages.go b/errormessages.go
index 27a71fd..ed56fae 100644
--- a/errormessages.go
+++ b/errormessages.go
@@ -10,6 +10,8 @@ const (
 	MsgErrCannotCreate              = "cannotCreate"
 	MsgErrUnkownHTTPContentType     = "unkownHTTPContentType"
 	MsgErrUnknownResponseStatusCode = "unknownResponseStatusCode"
+	MsgErrExistingValue             = "existing"
+	MsgErrReadOnly                  = "readOnlyValue"
 
 	EvenParams       = "key/valParametersShouldBeEven"
 	TokenProviderURL = "tokenProviderURL"
@@ -18,4 +20,6 @@ const (
 	Response         = "response"
 	AccessToken      = "accessToken"
 	OIDCProvider     = "OIDCProvider"
+	UserOrEmail      = "UsernameOrEmail"
+	Username         = "username"
 )
diff --git a/keycloak_client.go b/keycloak_client.go
index fb245dd..659183e 100644
--- a/keycloak_client.go
+++ b/keycloak_client.go
@@ -412,6 +412,17 @@ func whitelistErrors(statusCode int, message string) error {
 			Status:  statusCode,
 			Message: "keycloak." + message,
 		}
+	// update account in back-office or self-service
+	case (message == "User exists with same username or email") || (message == "usernameExistsMessage") || (message == "emailExistsMessage"):
+		return commonhttp.Error{
+			Status:  statusCode,
+			Message: "keycloak." + MsgErrExistingValue + "." + UserOrEmail,
+		}
+	case message == "readOnlyUsernameMessage":
+		return commonhttp.Error{
+			Status:  statusCode,
+			Message: "keycloak." + MsgErrReadOnly + "." + Username,
+		}
 	default:
 		return HTTPError{
 			HTTPStatus: statusCode,