Can't Lock Graphical Desktop on RHEL 7.8

Working on a project where they make graphical desktops available to their data scientists. Received a security finding that the desktops didn't have automate screenlocking enabled. Threw together some automation to make the requisite security settings. However, when users login, we're still getting a popup that says (see attached image-snippet):

Screen lock disabled
Screen locking requires the GNOME display manager

Now, the system does have the:

• gdm-3.28.2-22.el7.x86_64
• grubby-8.28-26.el7.x86_64
• gnome-screensaver-3.6.1-20.el7.x86_64
• dconf-0.28.0-4.el7.x86_64

RPMs all installed. And the relevant dconf settings are applied. So, I'm not sure what's going on. I haven't submitted the system for scanning, yet, because I assume the popup means the scans will fail (but that may be a bad assumption). If such is the case, anyone have any ideas why I'm getting this popup and how to remediate it?