diff --git a/app/routes/automation.py b/app/routes/automation.py
index 031bb1e..d6fa572 100644
--- a/app/routes/automation.py
+++ b/app/routes/automation.py
@@ -793,8 +793,21 @@ def _parse_tns_resp(resp) -> tuple[bool, str]:
     """Parsea respuesta TNS: retorna (ok, msg). Trata 'ya existe' como OK."""
     try:
         body = resp.json()
-        ok = bool(body.get("status")) or bool((body.get("data") or {}).get("success"))
-        msg = body.get("message") or (body.get("data") or {}).get("response") or resp.text[:200]
+        raw_status = body.get("status")
+        # TNS usa status=true/false (booleano); ASP.NET usa status=400 (entero HTTP) → error
+        if isinstance(raw_status, bool):
+            ok = raw_status
+        elif isinstance(raw_status, int):
+            ok = raw_status < 400
+        else:
+            ok = bool(raw_status) or bool((body.get("data") or {}).get("success"))
+        # Mensaje: TNS normal vs error de validación ASP.NET
+        errors = body.get("errors")
+        if errors and isinstance(errors, dict):
+            msgs = [f"{k}: {v[0] if isinstance(v, list) else v}" for k, v in errors.items()]
+            msg = " | ".join(msgs)
+        else:
+            msg = body.get("message") or (body.get("data") or {}).get("response") or body.get("title") or resp.text[:200]
     except Exception:
         ok = resp.is_success
         msg = resp.text[:200]