You still did not read the wiki page correctly.
System Permissions & PolicyKit
I also found to enable shutdown/restart, network indicator etc I had to add this to /etc/auth-client-config/profile.d/sss
pam_session=
session optional pam_systemd.so
That means you need to add it AT THE START and then when you run this
sudo auth-client-config -a -p sss
It will create the file /etc/pam.d/common-session correctly without you having to edit it manually..... and this is the preferred way to do it so you can revert your changes with
sudo auth-client-config -a -p sss -r
The also occurs for mounting shares.
So the wiki is correct.
B. Rgds
John