Group Writeback: manage members and owners for Office 365 Groups
in the current state of the feature Group Writeback creates a representation of the corresponding Office 365 Group to the local AD.
Originally you cannot manage that groups properties in the local AD, as Azure ADConnect will undo your local changes and will not sync on-prem ADs changes back to Azure AD.
Now as Office 365 Groups are the fundament for Microsoft Teams, this should be changed to that workflow, if Group Writeback is enabled:
a. create the Office 365 Group (or Team) in Azure AD, setting up basic settings and initial owners/members
b. sync it down to my customers local AD by using the Group Writeback feature
c. update the members and owner/managed by properties in local AD
d. sync thar changes back to AzureAD, so Office 365 Groups get updated
In case of a conflict between cloud-managed membership and ownership and the one from the current AAD Connect Sync, the newest change should win.