You would if you want the ability for a cloud user to modify membership of an on-premise exchange group. Exchange Hybrid all the groups are on premise and synced. With old Exchange in Outlook a group owner could modify membership not anymore
Azure AD Group writeback for Exchange Hybrid?
asked 2021-11-18T15:41:43.353+00:00

geezberry21
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Reading the article is appears to be for 365 Groups but i am working with on-premise Exchange groups (stored in on-premise AD) that are synced to Exchange Online not Office 365 Groups. Is there any writeback capability for this?
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2021-11-18T15:44:17.163+00:00 Andy David - MVP 109K Reputation points Microsoft MVPYou wouldnt need writeback for on-prem groups because they already exist. :)
365 Groups can be written back to on-prem because those objects are sourced in Exchange Online and do not exist on-prem by default.