How to add a shared mailbox in Outlook mobile on Android

Step 1: Open Outlook

Step 2: Tap Calendar at the bottom. 

Step 3: Tap your profile icon in the top left corner.

Step 4: Tap the Add icon.

Step 5: Tap Add a shared calendar.  

Step 6: Enter either People, rooms or Mailboxes.

Step 7: Tap the desired result.