XFCE4 won't Suspend or Hibernate

When I try the Suspend (or Hibernate) in the Actions Buttons plugin, I get a popup window:

Failed to run action "Suspend" GDBus.Error:org.xfce.SessionManager.Error.Failed: Failed to lock the screen.

Suspending via: $ systemctl suspend works fine.

Also, locking works fine using the Action Button, "Lock Screen"

If I run: $ xfce4-session-logout --suspend

I get a popup window:

"Received error while trying to log out GDBus.Error:org.freedesktop.DBus.Error.InvalidArgs: Type of message, "(yb)", does not match expected type "(b")""

and the following is output on the command line:

"Received error while trying to log out, error was GDBus.Error:org.xfce.SessionManager.Error.Failed: Failed to lock the screen."

$ xfconf-query -c xfce4-session -p /general/LockCommand outputs: dm-tool lock

$ dm-tool lock

works fine.

Fedora F37 versions:
libxfce4util-4.16.0-6.fc37.x86_64
libxfce4ui-4.16.1-3.fc37.x86_64
xfce4-panel-4.16.5-1.fc37.x86_64
xfce4-settings-4.16.5-1.fc37.x86_64
xfce4-session-4.16.0-6.fc37.x86_64
xfce4-dict-0.8.4-5.fc37.x86_64
xfce4-dict-plugin-0.8.4-5.fc37.x86_64
xfce4-pulseaudio-plugin-0.4.4-1.fc37.x86_64
xfce4-xkb-plugin-0.8.3-2.fc37.x86_64
xfce4-battery-plugin-1.1.4-4.fc37.x86_64
xfce4-clipman-plugin-1.6.2-5.fc37.x86_64
xfce4-cpufreq-plugin-1.2.7-2.fc37.x86_64
xfce4-cpugraph-plugin-1.2.6-2.fc37.x86_64
xfce4-datetime-plugin-0.8.1-5.fc37.x86_64
xfce4-diskperf-plugin-2.7.0-2.fc37.x86_64
xfce4-eyes-plugin-4.6.0-2.fc37.x86_64
xfce4-fsguard-plugin-1.1.2-5.fc37.x86_64
xfce4-genmon-plugin-4.1.1-5.fc37.x86_64
xfce4-mailwatch-plugin-1.3.0-5.fc37.x86_64
xfce4-mount-plugin-1.1.5-5.fc37.x86_64
xfce4-mpc-plugin-0.5.2-7.fc37.x86_64
xfce4-netload-plugin-1.4.0-4.fc37.x86_64
xfce4-notes-plugin-1.9.0-5.fc37.x86_64
xfce4-notifyd-0.6.4-1.fc37.x86_64
xfce4-power-manager-4.16.0-6.fc37.x86_64
xfce4-sensors-plugin-1.4.3-5.fc37.x86_64
xfce4-smartbookmark-plugin-0.5.2-5.fc37.x86_64
xfce4-systemload-plugin-1.3.1-4.fc37.x86_64
xfce4-time-out-plugin-1.1.2-4.fc37.x86_64
xfce4-timer-plugin-1.7.1-7.fc37.x86_64
xfce4-verve-plugin-2.0.1-5.fc37.x86_64
xfce4-wavelan-plugin-0.6.3-2.fc37.x86_64
xfce4-weather-plugin-0.11.0-4.fc37.x86_64
xfce4-places-plugin-1.8.3-1.fc37.x86_64
xfce4-volumed-0.2.3-30.fc37.x86_64
xfce4-terminal-1.0.4-2.fc37.x86_64
xfce4-appfinder-4.16.1-5.fc37.x86_64
xfce4-about-4.16.1-3.fc37.x86_64
xfce4-taskmanager-1.5.4-2.fc37.x86_64
xfce4-dev-tools-4.16.0-5.fc37.x86_64
libxfce4util-devel-4.16.0-6.fc37.x86_64
libxfce4ui-devel-4.16.1-3.fc37.x86_64
xfce4-panel-devel-4.16.5-1.fc37.x86_64
xfce4-screensaver-4.16.0-8.fc37.x86_64
xfce4-screenshooter-1.10.3-1.fc37.x86_64
xfce4-screenshooter-plugin-1.10.3-1.fc37.x86_64
xfce4-whiskermenu-plugin-2.7.2-1.fc37.x86_64

I've seen other reports of this issue, with no resolution offered. I'm bringing it up again, and hoping for some resolution.