Configuring preferences and options in Outlook.com
Hi, I'm Diane and I'm happy to help you today.
This is with an outlook.com account?
Are you using new Outlook or classic Outlook on the desktop? I'm not able to repro it in any of the Outlook apps, although the automatic replies option is often missing from new Outlook until I restart it.
Let me know how it goes, I'm here to help you further if needed.
-- Diane