User Permission with user group at Linux

Dear all,

I have created a User role at VMware server 2 named "AAA" which allowing users to control the VM.

I grant a user with AAA role, it works great.

I grant a user group with AAA role, those users in the group are not applying the access right.

Am i using the wrong way to grant user access right to a group of user?

Or any way to cater this issue.

Thank you very much.