https://techcommunity.microsoft.com/discussions/microsoft-365/folders-and-rules-support-for-microsoft-365-groups-in-outlook-mc422161/3655131
Folders and Rules Support for Microsoft 365 Groups in Outlook MC422161 | Microsoft Community Hub
Per Message Center update #MC422161, in OWA for groups, if you enable it, you are supposed to be able to create a folder in OWA for the group mailbox. ...