diff --git a/litellm/proxy/auth/login_utils.py b/litellm/proxy/auth/login_utils.py
index 6ca7ea5074d..c0a76a4fc20 100644
--- a/litellm/proxy/auth/login_utils.py
+++ b/litellm/proxy/auth/login_utils.py
@@ -362,8 +362,13 @@ async def authenticate_user(
                 code=401,
             )
     else:
+        env_credentials_hint: Final = (
+            "\nCheck 'UI_USERNAME', 'UI_PASSWORD' in .env file"
+            if is_env_credential_login_enabled(general_settings)
+            else ""
+        )
         raise ProxyException(
-            message="Invalid credentials used to access UI.\nCheck 'UI_USERNAME', 'UI_PASSWORD' in .env file",
+            message=f"Invalid credentials used to access UI.{env_credentials_hint}",
             type=ProxyErrorTypes.auth_error,
             param="invalid_credentials",
             code=401,
diff --git a/tests/test_litellm/proxy/auth/test_login_utils.py b/tests/test_litellm/proxy/auth/test_login_utils.py
index 72cc6e04a12..e209a491b0a 100644
--- a/tests/test_litellm/proxy/auth/test_login_utils.py
+++ b/tests/test_litellm/proxy/auth/test_login_utils.py
@@ -186,6 +186,7 @@ async def test_authenticate_user_invalid_credentials():
         assert exc_info.value.type == ProxyErrorTypes.auth_error
         assert exc_info.value.code == "401"
         assert "Invalid credentials" in exc_info.value.message
+        assert "UI_USERNAME" in exc_info.value.message
 
 
 @pytest.mark.asyncio
@@ -829,6 +830,8 @@ class TestDisableEnvCredentialLogin:
 
         assert exc_info.value.type == ProxyErrorTypes.auth_error
         assert exc_info.value.code == "401"
+        assert "UI_USERNAME" not in exc_info.value.message
+        assert "UI_PASSWORD" not in exc_info.value.message
 
     @pytest.mark.asyncio
     async def test_rejects_master_key_fallback_when_disabled(self):