CentOS Linux 8 issue with sudo - Version bug?

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Please help me understand why this works this way:
https://unix.stackexchange.com/questions/109944/why-is-the-sudo-password-different-than-the-su-root-password

Context: When I type say ‘sudo useradd Bob’ CentOS 8 asks for the password of what I am currently logged in as (NOT an admin by design) instead of the root password.

Is this expected in version 8 or is there a glitch I need to fix?

Thank you in advance.

@Daniel-Fiore You add the user (that you are currently logged in as) to the (privileged) sudoers group. When you run the sudo command, the system checks to see if the current user is part of that group, asks for that user's password, and runs/rejects that command appropriately based on other defined rules... Been like that as long as I can remember.

@Daniel-Fiore said in CentOS Linux 8 issue with sudo - Version bug?:

https://unix.stackexchange.com/questions/109944/why-is-the-sudo-password-different-than-the-su-root-password

Please check your 'sudo' permissions:
$ sudo -l

[ronnie@localhost ~]$ sudo -l

We trust you have received the usual lecture from the local System
Administrator. It usually boils down to these three things:

    #1) Respect the privacy of others.
    #2) Think before you type.
    #3) With great power comes great responsibility.

[sudo] password for ronnie: 
Sorry, user ronnie may not run sudo on localhost.
[ronnie@localhost ~]$ 

[ronnie@localhost ~]$ sudo useradd Bob
[sudo] password for ronnie: 
ronnie is not in the sudoers file.  This incident will be reported.
[ronnie@localhost ~]$

[ronnie@localhost ~]$ su
Password: 
[root@localhost ronnie]# sudo useradd Betty
[root@localhost ronnie]#
[ronnie@localhost ~]$ sudo -l
<output omitted>
User root may run the following commands on localhost:
    (ALL) ALL

I used CentOS 7 for a long time. The sudoer issues were such a pain doing anything, I switched to Ubuntu 18.04 LTS. CentOS7 firewall was always blocking. I constantly switch to root to add users and install. It is not a bug. It is such tight security that it protects your computer from you. Windows 8 and 10 do the same things they want your computer to be protected from end users doing anything.

Got it. Thank you.