It is soooooooooooooooooo intuitive
First you need to select account settings, account settings
Then you select Change
Then you select Advanced settings (maybe “more settings…”)
Then you go to “Advanced” and “Add” and add the shared mailbox
Bloopers?
Why do I need to go to “my account” settings when I just want to add a shared mailbox?
Then why should I need to select “change” for something I want to add?
…