We apologize for the inconvenience. We currently don’t support the ability to open shared mailboxes or other mailboxes that you have permissions to access.
To open these mailboxes, you can access Outlook from a desktop browser (by requesting the desktop site in the browser settings) or use the Outlook mobile app that can be downloaded from the iOS and Android app store.
An error occurred while saving the commentLars-Eric Magnusson commented
That's really ******!
Used shared mailboxes on my phone for years and now for some reason you decide to remove it?? Why?