Problem with Schedule Email parameters in "Send Reply to an Email" API

Problem with Schedule Email parameters in "Send Reply to an Email" API

Hello,

This is my Json script:
{
  "fromAddress": "test@gmail.com",
  "toAddress": "{{8.fromAddress}}",
  "subject": "{{8.subject}}",
  "content": "{{4.result}}",
  "action": "reply",
  "isSchedule": true,
  "scheduleType": 6,
  "timeZone": "Europe/Lisbon", 
  "scheduleTime": "09/15/2026 14:30:28"
}

but when I run it the email just sends as a reply instead of being scheduled. Can anyone help?