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You can set the auto-replies for shared mailboxes from the outlook website - https://outlook.office365.com/mail/inbox.
Log in with your C#@camosun.ca and click on your name in the top right corner and click "Open another mailbox".
Search for the name of the mailbox and select it.
It should open up that mailbox. Click on the cog wheel in the upper right
for Settings, and click "View all Outlook settings" at the bottom.
Click Mail, then Automatic Replies, and there you can set up the Autoreply for the shared mailbox.