We are using an Office365 Hyrbid deployment with Exchange 2016 on premise. The Hybrid setup was deployed after our users and groups were created and synced from AD, so they do not currently appear in our Exchange server.
Is there any way to make these groups Exchange aware, without having to delete and recreate them from scratch?
With our mailboxes in Exchange Online, we had to run a New-RemoteMailbox command for each mailbox, so wonder if there is some way to manually populate the required attributes in these groups so they show in Exchange.
I suspect not possible though.
EDIT: I should point out that when we synced the groups, we had already populated the ProxyAddresses attribute, so that they appeared with the correct domain in 365. What we want is for these groups to now be manageable from our on premise Exchange server.