add assignedTo field to unique fields endpoint

src/notification/notification.service.ts

@@ -152,7 +152,7 @@ export async function getUniqueValuesNotification(
   } else if (field === "client") {
     matchedValues = await orgModel.find().where("_id").in(values).exec();
   } else if (field === "assignedTo") {
-    matchedValues = await userModel.find().where("name").in(values).exec();
+    matchedValues = await userModel.find().where("_id").in(values).exec();
   }
 
   if (matchedValues.length > 0) {