diff --git a/src/modules/ar1/pages/Ar1AdminConfig.js b/src/modules/ar1/pages/Ar1AdminConfig.js
index 8dd67c2..ace11ed 100644
--- a/src/modules/ar1/pages/Ar1AdminConfig.js
+++ b/src/modules/ar1/pages/Ar1AdminConfig.js
@@ -58,8 +58,24 @@ const PEC_KIND_OPTIONS = [
     { label: PEC_KIND_LABEL.AR1_BULK_MANUAL, value: 'AR1_BULK_MANUAL' }
 ];
 
+
+// Normalizza il campo detail che puo essere string o array Pydantic [{loc, msg, type}]
+const formatErrorDetail = (detail, fallback) => {
+    if (!detail) return fallback || 'Errore';
+    if (typeof detail === 'string') return detail;
+    if (Array.isArray(detail)) {
+        return detail.map(e => {
+            const loc = Array.isArray(e.loc) ? e.loc.filter(x => x !== 'body').join('.') : '';
+            const msg = e.msg || e.message || JSON.stringify(e);
+            return loc ? `${loc}: ${msg}` : msg;
+        }).join('; ');
+    }
+    if (typeof detail === 'object') return JSON.stringify(detail);
+    return String(detail);
+};
+
 /**
- * Ar1AdminConfig — configurazione AR1 per superadmin. (build 1776950454)
+ * Ar1AdminConfig — configurazione AR1 per superadmin. (build 1776950637)
  * URL: /ar1-admin
  *
  * 5 sezioni (TabView):
@@ -163,19 +179,19 @@ const Ar1AdminConfig = () => {
         setLoadingTpl(true);
         Ar1Service.listTemplates(
             (resp) => { setTemplates(resp?.items || resp || []); setLoadingTpl(false); },
-            (err) => { setLoadingTpl(false); if (toast.current) toast.current.show({ severity: 'error', summary: 'Errore', detail: err?.detail || 'Caricamento template fallito' }); }
+            (err) => { setLoadingTpl(false); if (toast.current) toast.current.show({ severity: 'error', summary: 'Errore', detail: formatErrorDetail(err?.detail, 'Caricamento template fallito') }); }
         );
     };
     const loadPolicy = () => {
         Ar1Service.getPolicy(
             (resp) => { setPolicy(resp); setPolicyDraft(resp); },
-            (err) => { if (toast.current) toast.current.show({ severity: 'error', summary: 'Errore', detail: err?.detail || 'Caricamento policy fallito' }); }
+            (err) => { if (toast.current) toast.current.show({ severity: 'error', summary: 'Errore', detail: formatErrorDetail(err?.detail, 'Caricamento policy fallito') }); }
         );
     };
     const loadPecRules = () => {
         Ar1Service.listPecSchedule(
             (resp) => setPecRules(resp?.items || resp || []),
-            (err) => { if (toast.current) toast.current.show({ severity: 'error', summary: 'Errore', detail: err?.detail || 'Caricamento regole fallito' }); }
+            (err) => { if (toast.current) toast.current.show({ severity: 'error', summary: 'Errore', detail: formatErrorDetail(err?.detail, 'Caricamento regole fallito') }); }
         );
     };
     const loadDocCategories = () => {
@@ -192,7 +208,7 @@ const Ar1AdminConfig = () => {
                 setAvailableVariables(resp?.available_variables || []);
                 setLoadingEmail(false);
             },
-            (err) => { setLoadingEmail(false); if (toast.current) toast.current.show({ severity: 'error', summary: 'Errore', detail: err?.detail || 'Caricamento testi fallito' }); }
+            (err) => { setLoadingEmail(false); if (toast.current) toast.current.show({ severity: 'error', summary: 'Errore', detail: formatErrorDetail(err?.detail, 'Caricamento testi fallito') }); }
         );
     };
 
@@ -268,7 +284,7 @@ const Ar1AdminConfig = () => {
                 setEditLayoutOpen(false);
                 loadTemplates();
             },
-            (err) => { if (toast.current) toast.current.show({ severity: 'error', summary: 'Errore', detail: err?.detail || 'Salvataggio fallito' }); }
+            (err) => { if (toast.current) toast.current.show({ severity: 'error', summary: 'Errore', detail: formatErrorDetail(err?.detail, 'Salvataggio fallito') }); }
         );
     };
 
@@ -292,7 +308,7 @@ const Ar1AdminConfig = () => {
                 setNewVersionOpen(false);
                 loadTemplates();
             },
-            (err) => { if (toast.current) toast.current.show({ severity: 'error', summary: 'Errore', detail: err?.detail || 'Creazione fallita' }); }
+            (err) => { if (toast.current) toast.current.show({ severity: 'error', summary: 'Errore', detail: formatErrorDetail(err?.detail, 'Creazione fallita') }); }
         );
     };
 
@@ -319,7 +335,7 @@ const Ar1AdminConfig = () => {
             },
             (err) => {
                 setSavingPolicy(false);
-                if (toast.current) toast.current.show({ severity: 'error', summary: 'Errore', detail: err?.detail || 'Salvataggio fallito' });
+                if (toast.current) toast.current.show({ severity: 'error', summary: 'Errore', detail: formatErrorDetail(err?.detail, 'Salvataggio fallito') });
             }
         );
     };
@@ -353,7 +369,7 @@ const Ar1AdminConfig = () => {
             setPecDialogOpen(false);
             loadPecRules();
         };
-        const onKo = (err) => { if (toast.current) toast.current.show({ severity: 'error', summary: 'Errore', detail: err?.detail || 'Salvataggio fallito' }); };
+        const onKo = (err) => { if (toast.current) toast.current.show({ severity: 'error', summary: 'Errore', detail: formatErrorDetail(err?.detail, 'Salvataggio fallito') }); };
         if (pecEditing) Ar1Service.updatePecRule(pecEditing.id, payload, onOk, onKo);
         else Ar1Service.createPecRule(payload, onOk, onKo);
     };
@@ -372,7 +388,7 @@ const Ar1AdminConfig = () => {
                         if (toast.current) toast.current.show({ severity: 'success', summary: 'Eliminata', detail: 'Regola eliminata' });
                         loadPecRules();
                     },
-                    (err) => { if (toast.current) toast.current.show({ severity: 'error', summary: 'Errore', detail: err?.detail || 'Eliminazione fallita' }); }
+                    (err) => { if (toast.current) toast.current.show({ severity: 'error', summary: 'Errore', detail: formatErrorDetail(err?.detail, 'Eliminazione fallita') }); }
                 );
             }
         });
@@ -400,7 +416,7 @@ const Ar1AdminConfig = () => {
             },
             (err) => {
                 setBulkRunning(false);
-                if (toast.current) toast.current.show({ severity: 'error', summary: 'Errore', detail: err?.detail || 'Invio fallito' });
+                if (toast.current) toast.current.show({ severity: 'error', summary: 'Errore', detail: formatErrorDetail(err?.detail, 'Invio fallito') });
             }
         );
     };
@@ -433,7 +449,7 @@ const Ar1AdminConfig = () => {
                 setEditEmailOpen(false);
                 loadEmailTemplates();
             },
-            (err) => { if (toast.current) toast.current.show({ severity: 'error', summary: 'Errore', detail: err?.detail || 'Salvataggio fallito' }); }
+            (err) => { if (toast.current) toast.current.show({ severity: 'error', summary: 'Errore', detail: formatErrorDetail(err?.detail, 'Salvataggio fallito') }); }
         );
     };
 
@@ -444,7 +460,7 @@ const Ar1AdminConfig = () => {
                 setPreviewSubject(resp.subject);
                 setPreviewHtml(resp.body_html);
             },
-            (err) => { if (toast.current) toast.current.show({ severity: 'error', summary: 'Errore', detail: err?.detail || 'Anteprima fallita' }); }
+            (err) => { if (toast.current) toast.current.show({ severity: 'error', summary: 'Errore', detail: formatErrorDetail(err?.detail, 'Anteprima fallita') }); }
         );
     };