diff --git a/modules/turnero/api/guardar_toma.php b/modules/turnero/api/guardar_toma.php
index 7187a83..e009bf0 100644
--- a/modules/turnero/api/guardar_toma.php
+++ b/modules/turnero/api/guardar_toma.php
@@ -108,8 +108,16 @@ foreach ($esquema as $campo) {
 $__tcFirmas = $datosMerge['_tomas_config'] ?? null;
 if (is_array($__tcFirmas)) {
     $__allowed = [];
-    foreach ($__tcFirmas as $__g => $__ids) {
-        if (is_array($__ids)) foreach ($__ids as $__id) $__allowed[$__id] = true;
+    foreach ($__tcFirmas as $__v) {
+        if (!is_array($__v)) continue;
+        $__inner = reset($__v);
+        if (is_array($__inner)) {
+            // nested: { examName: { groupKey: [fids] } }
+            foreach ($__v as $__fids) foreach ($__fids as $__f) $__allowed[$__f] = true;
+        } else {
+            // flat: { groupKey: [fids] }
+            foreach ($__v as $__f) $__allowed[$__f] = true;
+        }
     }
     $firmasCampos = array_values(array_filter($firmasCampos, fn($f) => isset($__allowed[$f['id']])));
 }