Hi @OZ,
Welcome to the Microsoft Q&A platform!
Based on your description, you have taken most of the correct steps to allow users to manage group membership. However, there may be some additional areas to check:
- Changes in Active Directory (AD) may take some time to synchronize with Exchange. Make sure enough time has passed to propagate the changes.
- Double-check the settings in OWA to make sure no permissions are overwriting the changes you made. Sometimes, despite having the correct permissions in AD, certain settings restrict users.
- Verify that the group is set up as a distribution group rather than a security group. Although both can be mail-enabled, there may be subtle differences in how permissions are applied.
- Make sure the user is assigned the correct role in the Exchange Admin Center. Specific roles must be assigned for managing group membership. You may need to assign the user the Distribution Groups and MyDistributionGroups management roles.
- You can use the Exchange Management Shell to verify and adjust permissions. Here is the command to add a user to the Group Management role:
Add-RoleGroupMember "Group Management" -Member <UserAlias>
Replace '<UserAlias>' with the actual alias of the user.
- Make sure that permission inheritance is turned on for the user in AD. Sometimes permissions don't propagate correctly if inheritance is disabled.
- Make sure there are no conflicting policies or settings that could be overriding permissions. Group Policy Objects (GPOs) or other security settings in AD can sometimes interfere.
If after verifying these aspects, the user still cannot edit group memberships, check the logs for any specific error messages.
Please feel free to contact me for any updates. And if this helps, don't forget to mark it as an answer.
Best,
Jake Zhang