When creating demo clusters for customers I frequently setup github authentication and 2 groups since it's quick and easy. 

I normally create a Cluster-Admins and a Cluster-Readers group

I stood up a new ocp 4.11 in AWS this afternoon. With just me added to cluster-admin group with cluster admin permission it works as expected. However, as soon as I add another user (no matter the method, GUI, yaml, etc) I become a regular user with no permissions to anything. At this point I have to logout and login as Kubeadmin and remove the 2nd user from the group. At first I thought it was an issue of the 2nd user not having logged in yet so I tried adding a 2nd user that already exists in the system and the same issue occurs.