Add a Shared Mailbox to Outlook Mobile

If you use Outlook for iOS or Outlook for Android, you can add a shared mailbox you have permissions to access on Outlook Mobile.

  1. Sign in to your primary account in Outlook for iOS or Android.
  2. Tap the Add Account button in the left navigation pane, then tap Add a Shared Mailbox.
    Add an account to the Outlook app
  3. If you have multiple accounts in Outlook Mobile, select the account that has permissions to access the shared mailbox.
    Enter your email address.

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.

 

Source: https://support.office.com/en-us/article/add-a-shared-mailbox-to-outlook-mobile-f866242c-81b2-472e-8776-6c49c5473c9f