I've managed to set-up a 'Current User' Email Account and accompanying AAD App Registration. When I click the [Verify Registration] button on the Email Application AAD Registration page in BC it reports 'Success! Your authentication was verified.'
However, when I try and send an email via the 'Email Editor (13, Document) page, it reports:-
The email was not sent because of the following error: "The mailbox is either inactive, soft-deleted, or is hosted on-premise." Depending on the error, you might need to contact your administrator.
This error is also encountered when attempting to send a test email from the Email Accounts page.
How do I get this working?