An quirk of G Suite's email delegation feature is that
- items sent by a delegate via the Gmail web app are stored in the delegator's "Sent Items" folder, but
- items sent by a delegate via G Suite Sync for Microsoft Outlook (GSSMO) are stored in the delegate's Sent Items folder, where they can't be seen by the delegator.
Can't see delegate's Sent Items: Messages sent on your behalf are available in the delegate's Sent Items folder but not yours. As a result, you won't see messages sent on your behalf until a reply appears in your inbox.
Are there any non-Google ways to move sent items to the delegator's Sent Items folder?
I thought I could set up a Rule in Outlook on "messages I send", but the "from" condition is only available for "messages I receive".