These instructions are for adding a shared mailbox to the Outlook App on an iPhone or iPad
In the Outlook App, tap on the 3 vertical lines in the top right corner, then select the "Settings" icon(looks like a cog-wheel) a the bottom.
On the Settings screen, choose "Add Account", then choose "Add Email Account". Enter the name of the shared account(example: firstname.lastname@example.org), then choose Add Account. This will take you to an office 365 login screen asking for a password. Since it is a shared mailbox and you most likely do not have a password, click the back arrow in the top corner. There is a new option on the screen called "Setup Account Manually" choose that option.
On the next screen scroll down to where it says ADVANCED and select IMAP
Turn on the switch for and Use Advanced Settings and enter the following information:
E-mail Adress: (enter_the_name_of_the_shared_mailbox)@davidson.edu
Display Name: What you want the Mailbox to be called
Description: You can leave blank
IMAP Hostname: outlook.office365.com
IMAP Username: (your_primary_account)@davidson.edu\enter_the_name_of_the_shared_mailbox
IMAP Password: YOUR account password
SMTP Hostname: smtp.office365.com:587
SMTP Username: (your_primary_account)@davidson.edu
Password: YOUR account password
Select Sign In. If all the information you entered is correct, you will now have access to the shared mailbox on your iOS device