diff --git a/src/main/java/com/eactive/apim/portal/apps/user/facade/OrgRegisterFacadeImpl.java b/src/main/java/com/eactive/apim/portal/apps/user/facade/OrgRegisterFacadeImpl.java
index b23c960..cd54643 100644
--- a/src/main/java/com/eactive/apim/portal/apps/user/facade/OrgRegisterFacadeImpl.java
+++ b/src/main/java/com/eactive/apim/portal/apps/user/facade/OrgRegisterFacadeImpl.java
@@ -76,7 +76,7 @@ public class OrgRegisterFacadeImpl implements OrgRegisterFacade {
 
         // 2025.10.20 - 휴대폰 번호 중복 무시
 //        PortalUser existingUser = portalUserRepository.findByUserNameAndMobileNumber(orgDTO.getUserName(), orgDTO.getMobileNumber());
-        Optional<PortalUser> existingUser = portalUserRepository.findByUserName(orgDTO.getUserName());
+        Optional<PortalUser> existingUser = portalUserRepository.findByUserName(orgDTO.getLoginId());
 
         if(existingUser.isPresent()) {
             return new ValidationResponse(false, "가입된 계정이 이미 존재합니다.");