Hi,
Earlier, in the beta version, we had 'New-Groupmember' which worked as adding new member to any group. But, now we don't have 'New-MgGroupmember' so I tried assigning a member using 'Update-MgGroup' with a parameter '-Members' and tried passing a list of members(users) as directory objects. When I did so, I noticed that although it didn't give any error, it failed to update that group. The same thing happened when I tried updating owner with param -Owners.
Refer to below screenshot(updating group Owners) for more info and let me know if there's a mistake in my approach.

cc: @KirkMunro
AB#7430