Is it possible to configure Office 365 Groups so that users cannot leave a group? It would be nice if you could have a fully managed group where only the owner of the group can add or remove users.

But (second thought)... For groups where you wanted to "protect" group membership, you could write some PowerShell to run in the background and validate group memberships. Paul Cunningham posted an example at https://practical365.com/collaboration/groups/powershell-script-generate-reports-groups-office-365/ It would then be easy to find when users left a "protected" group and add them back again.

Dynamic groups are actually a pretty good suggestion because they absolutely do work if your Azure Active Directory is populated accurately in terms of department or other information. The downside, as you note, is cost, If you don't have a reason to use Azure AD Premium licenses, dynamic groups can be an expensive option. See https://www.petri.com/microsoft-clarifies-premium-features-office-365-groups for more information.

For example, if you have a dedicated Office 365 Group for collaboration (Teams, Planner, Mail) for each Team or Department in you organization the users should not be able to just leave the group! Yes, Dynamic Groups could possibly be used to achieve this but as far as I know that requires a Premium Azure AD license? In my opinion, if Microsoft wants us to replace Distribution Lists with Office 365 Groups, this is functionality that should be there by default and without any extra cost!

I stand corrected. The Azure AD Dynamic group membership is much more feature-rich than the Exchange Online one.

I'm not aware of a way to do this. I have been reviewing the options available at both the EXO Admin Center and set-UnifiedGroup cmdlet and apparently this is a feature not provided Today. But since I'm not a 100 % sure, tagging here TonyRedmond cfiessinger

Disable "Leave Group" functionality in Office 365 Groups

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Aim Zaab
Brass Contributor
Jun 20, 2018
Indeed we should be able to "lock" an Office 365 group so members can't leave from it. Especially with Teams, it's really easy to leave a Team and so the group.

Also we should have a way to prevent Office 365 groups deletion by owners.
Mart Lehtmets
Brass Contributor
Jan 22, 2018
I cought up with this problem today also. There is no way I can hold the user from leaving from the group. I know that the possibility in my organization is low for that to happen, but still. I agree with previous responders that why isn't this possibility enabled for Office 365 Groups if Office 365 groups should be upgrade for Distribution groups not downgrade from the simple functionality.
TonyRedmond
MVP
Jan 16, 2018
Make the group private. Only group owners can add or remove members from private groups.
- mattias-skog
  Iron Contributor
  Jan 16, 2018
  But still, even if the group is private, the user has the option to leave the group at anytime if he wants to? I haven't tested it myself but at least the option is there in all applications (Outlook, Teams etc)...
  - cfiessinger
    Microsoft
    Jan 16, 2018
    Can you please explain the use case/scenario to force users to "stay"?
    
    (note you could use dynamic membership to achieve this)
jcgonzalezmartin
MVP
Jan 16, 2018
I'm not aware of a way to do this. I have been reviewing the options available at both the EXO Admin Center and set-UnifiedGroup cmdlet and apparently this is a feature not provided Today. But since I'm not a 100 % sure, tagging here TonyRedmond cfiessinger

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Disable "Leave Group" functionality in Office 365 Groups

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