diff --git a/backend/api/v1/modules/core/users/routes.py b/backend/api/v1/modules/core/users/routes.py
index 4dd1a10..44a9d2b 100644
--- a/backend/api/v1/modules/core/users/routes.py
+++ b/backend/api/v1/modules/core/users/routes.py
@@ -53,12 +53,17 @@ async def get_user_statistics(
     """
     tenant_id = validate_access_to_resource(db, company_id, current_user, required_permissions=["user.view"])
     service = UserService(db, tenant_id, company_id, is_hub_admin=is_hub_admin(current_user))
+    from core.hub_token import get_hub_access_token
+
     auth_header = request.headers.get("Authorization") or ""
     token = (
         auth_header[7:].strip()
         if auth_header.lower().startswith("bearer ")
         else auth_header.strip()
     )
+    kc_token = await get_hub_access_token(request)
+    if kc_token:
+        token = kc_token
     hub_tid = resolve_hub_tenant_id_for_api(
         tenant_id, request.headers.get("X-Tenant-Override")
     )
@@ -84,12 +89,19 @@ async def list_users(
     """
     tenant_id = validate_access_to_resource(db, company_id, current_user, required_permissions=["user.view"])
     service = UserService(db, tenant_id, company_id, is_hub_admin=is_hub_admin(current_user))
+    # El Bearer de la app puede ser la sesión local (SIWEB), que el Hub no acepta.
+    # Para listar usuarios del tenant se usa el token KC de la sesión (valkey), refrescado.
+    from core.hub_token import get_hub_access_token
+
     auth_header = request.headers.get("Authorization") or ""
     token = (
         auth_header[7:].strip()
         if auth_header.lower().startswith("bearer ")
         else auth_header.strip()
     )
+    kc_token = await get_hub_access_token(request)
+    if kc_token:
+        token = kc_token
     hub_tid = resolve_hub_tenant_id_for_api(
         tenant_id, request.headers.get("X-Tenant-Override")
     )
diff --git a/backend/core/hub_token.py b/backend/core/hub_token.py
new file mode 100644
index 0000000..2c2c6a3
--- /dev/null
+++ b/backend/core/hub_token.py
@@ -0,0 +1,67 @@
+"""
+Obtención de un access token de Keycloak VÁLIDO para llamar a la API del Hub.
+
+Con el patrón de sesión local (SIWEB) el Bearer de la app es un JWT propio (HS256)
+que el Hub NO entiende. Para las llamadas server→Hub se usa el token KC guardado en
+la sesión (valkey, vía cookie crm_sid), refrescándolo si está por expirar.
+"""
+
+import logging
+import time
+from typing import Optional
+
+import httpx
+from jose import jwt
+
+from core.config import settings
+from core import session_store
+
+logger = logging.getLogger(__name__)
+
+
+def _kc_exp_ok(token: str, leeway_seconds: int = 30) -> bool:
+    """True si el token KC no está expirado (con margen)."""
+    try:
+        claims = jwt.get_unverified_claims(token)
+        exp = claims.get("exp")
+        return isinstance(exp, (int, float)) and (int(exp) - int(time.time())) > leeway_seconds
+    except Exception:
+        return False
+
+
+async def get_hub_access_token(request) -> Optional[str]:
+    """
+    Devuelve un access token KC válido tomado de la sesión (valkey vía crm_sid),
+    refrescándolo contra el Hub si está por expirar. None si no hay sesión.
+    Best-effort: si el refresh falla, devuelve el token guardado (puede estar vencido).
+    """
+    sid = request.cookies.get("crm_sid") if request is not None else None
+    if not sid:
+        return None
+    sess = session_store.get_session(sid)
+    if not sess:
+        return None
+
+    access = sess.get("access_token")
+    refresh = sess.get("refresh_token")
+
+    if access and _kc_exp_ok(access):
+        return access
+
+    if refresh:
+        try:
+            async with httpx.AsyncClient(timeout=8.0) as client:
+                r = await client.post(
+                    f"{settings.HUB_URL}api/v1/auth/refresh",
+                    json={"refresh_token": refresh},
+                )
+            if r.status_code == 200:
+                data = r.json()
+                new_access = data.get("access_token") or access
+                session_store.update_session_tokens(sid, new_access, data.get("refresh_token") or refresh)
+                return new_access
+            logger.info("get_hub_access_token: Hub refresh devolvió %s", r.status_code)
+        except Exception as exc:
+            logger.warning("get_hub_access_token: refresh falló: %s", exc)
+
+    return access