fix: scheduling workflow emails (#10890)

Co-authored-by: CarinaWolli <wollencarina@gmail.com>

packages/features/ee/workflows/lib/reminders/emailReminderManager.ts

@@ -206,6 +206,7 @@ export const scheduleEmailReminder = async (
           enable: sandboxMode,
         },
       },
+      sendAt: data.sendAt,
     });
   }