Not sure if this is the right channel, but here goes... Got users running a full-screen desktop with the Desktop Viewer enabled. When they return from being away, their virtual desktop is locked. However, pressing Ctrl-Alt-Del doesn't send an unlock request to the virtual desktop, but on the host instead (which obviously brings up the Windows Security menu because their machine is unlocked, it's just the virtual session has locked). They say on the previous platform they used a Ctrl-Alt-Del sent an unlock request to their virtual desktop, which I want to recreate. Is there any way you can configure Workspace App and/or the Desktop Viewer so that the Ctrl-Alt-Del keystroke on the host passes in to the virtual session? The Ctrl-F1 doesn't work because Desktop Viewer is in use, and you can only configure the full-screen toggle via GPO in this format.

Educate users that Ctrl+Alt+Del = local, Ctrl+Alt+End = Citrix desktop.

Ctrl Alt End and Ctrl F1 don't work at all

Disable the ctrl-alt-del on screen lock is what I usually recommend.

Ah so it just goes straight to "gimme your password"?

Yarp

Is that the GPO security setting? Bet there's a CIS policy enabling it

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Yeah TBH it's probably some CIS policy getting thrown down that has brought it up. Bet it wasn't in place on the "old" platform

Are they only working in Citrix? if so, you can introduce Desktoplock and as Jeff said, disable ctrl+alt+delete and unlock straight on the published desktop. Sorta of a kiosk mode. https://docs.citrix.com/en-us/citrix-workspace-app-for-windows/workspace-windows-desktop-lock.html