If you use Outlook for iOS or Outlook for Android, you can add a shared mailbox, that you have permissions to access, on Outlook Mobile.
To access a shared mailbox on a mobile device, use the following steps.
After the account setup process completes, the shared mailbox will display in your account list in Outlook for iOS or Outlook for Android.
To remove a shared mailbox, go to Settings > Accounts. Then tap on the shared mailbox and select Delete Account.