Is there any experience to confirm my own with use of Connect to Mail to monitor a Shared Mailbox?
A Shared Mailbox does not use a separate logon. The Primary user logs onto Outlook and may access both the primary Inbox, and also the shared mailbox Inbox. Senders can send to either email address, and I will refer to them as EmailA for the primary and EmailB for the shared. If someone sent to EmailA, the email is viewed in Outlook in the EmailA Inbox. An email sent to EmailB is viewed in Outlook in the EmailB Inbox.
However when configuring Connect to Mail, there appears to be no ability to import the EmailB Inbox, even as the Email Configuration is set for EmailB, but you must use the credentials for the user who can access both EmailA and EmailB.
Our result appears backwards. All of the primary email is being ingested, and none of the target Shared Inbox EmailB.