We have recently migrated from Microsoft Exchange to Office 365.  When I add member in Distribution Group in https://outlook.office365.com/ecp, the below message is shown up:

The action 'Update-DistributionGroupMember', 'Identify,Members', can't be performed.

Please advise.

Hi,

This forum focus more on Office client side questions. Since this issue is more related to Office 365, I'd recommend you post a new question in the Office 365 Community forum:

http://community.office365.com/en-us/default.aspx

The reason why we recommend posting appropriately is you will get the most qualified pool of respondents, and other partners who read the forums regularly can either share their knowledge or learn from your interaction with us. Thank you for your understanding.

Steve Fan
TechNet Community Support