Each user here has a personal mailbox e.g.: personA@company.com.
Some users also have Full Access and Send As rights to a shared mailbox e.g.: email@example.com.
In Outlook 365 the user's personal mailbox and the shared mailbox show up.
However, we are not able to send an email from the shared mailbox or set up a default signature as the shared mailbox does not show up in the list of mailboxes.
We know we can add the shared mailbox in the "From" field when composing a new email.
However, when using this methode the mail is sent out from the user's personal mailbox (although to the receiver it looks like it's being sent from the shared mailbox).
Is it possible to have the shared mailbox just show up automatically when composing a new e-mail and to also have it in the list of signatures?