Microsoft AAD authentication

Hi, 

I want to give access to a selected users from AAD. Say there are 100 users in AAD - but I want to give access to only 24 selected users. I created a group for this in AAD. But even after giving access to only group - it is giving access to all users in AAD. 

Any solution. The solutions and options proposed in Microsoft document does not work. 

Snehal.