Sure

The Keyboard Shortcuts for Lock Screen is set to Ctrl+Alt+L
Found in Settings -> Keyboard Shortcuts -> Lock screen -> Ctrl+Alt+L

1) I can't lock the screen using the (keybinding / shortcut) Ctrl+Alt+L 
https://i.imgur.com/VKiXvZV.png

2) I can lock the screen by clicking on the lock option but the screen doesn't 
go blank
https://i.imgur.com/JDHEs2Q.png

3) Here's something that looks interesting I found in the journalctlr file
Oct 02 19:18:52 sys76 gnome-shell[2577]: meta_window_raise: assertion 
'!window->override_redirect' failed
Oct 02 19:18:52 sys76 gnome-shell[2577]: meta_window_lower: assertion 
'!window->override_redirect' failed
Oct 02 19:18:56 sys76 gsd-media-keys[2742]: Couldn't lock screen: Cannot invoke 
method; proxy is for the well-known name org.gnome.ScreenSaver without an 
owner, and proxy was constructed with the G_DBUS_PROXY_FLAGS_DO_NOT_AUTO_START 
flag

4) The full file is below


** Attachment added: "journalctl -b 0 > jour.txt  file requested"
   
https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/1898153/+attachment/5416816/+files/jour.txt

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https://bugs.launchpad.net/bugs/1898153

Title:
  I upgraded from 18.04 to 20.04.1 and  the screen doesn't lock or go
  blank at the set time.

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