First we are going to become root

sudo su

Next we are going to join the realm. This should installed everything needed after you run the command below

realm join --user domainadmin

Permit all users to log in.

realm permit --all

Add user group as root

nano /etc/sudoers

Paste into above file

%groupname@domain    ALL=(ALL:ALL) ALL

Allow sssd to create user directory

nano /etc/pam.d/common-session

Paste into above file

session optional skel=/etc/skel umask=077