NDR not received when sending from an Office 365 group

Thanks for finding this issue and discovering what's going on with message traces etc. To get it some visibility (and hopefully have Microsoft fix the problem), I wrote the problem up in https://office365itpros.com/2019/09/26/office-365-groups-ndr-oddity/ and have sent it to some folks in Microsoft who might be able to persuade some engineering effort to happen. Don't expect an earlt fix though. These things take time.