Все это время оно из за этого не работало....

Hotel/HotelRestApi/Controllers/HeadwaiterController.cs

@@ -25,7 +25,7 @@ namespace HotelRestApi.Controllers
             {
                 return _logic.ReadElement(new HeadwaiterSearchModel
                 {
-                    //HeadwaiterEmail = login,
+                    HeadwaiterEmail = login,
                     HeadwaiterPassword = password
                 });
             }

Hotel/HotelRestApi/Controllers/MainController.cs

@@ -89,7 +89,7 @@ namespace HotelRestApi.Controllers
             {
                 return _dinner.ReadList(new DinnerSearchModel
                 {
-                    //HeadwaiterId = headwaiterId,
+                    HeadwaiterId = headwaiterId,
                 });
             }
             catch (Exception ex)
@@ -123,7 +123,7 @@ namespace HotelRestApi.Controllers
             {
                 return _room.ReadList(new RoomSearchModel
                 {
-                    //HeadwaiterId = headwaiterId,
+                    HeadwaiterId = headwaiterId,
                 });
             }
             catch (Exception ex)