I’m not sure people use moderated distribution lists with Exchange Online all that much, but those who do might be frustrated by a client inconsistency between OWA and Outlook. OWA can expand the membership of a moderated distribution list; Outlook for Windows cannot. It’s a small point. Maybe Project Monarch will help…
https://office365itpros.com/2022/04/26/outlook-moderated-distribution-list/
