Remote Desktop keyboard shortcuts within another Remote Desktop session

I am accessing my desktop work machine through remote desktop. Inside this remote desktop session I am starting a remote desktop session to a windows server.

But the usual remote desktop shortcut keys:

(i.e. ctrl + alt + end for desktop equivalent to ctrl + alt + del)

is working only on my desktop machine, even if I have the remote server session full screen.

Is there a way I can use the shortcut keys on the server session?

From what I have read the key combination for the nested RDP session should be:

Ctrl + Alt + Shift + Home

It doesn't work for me from home, but it is likely a permission/version problem for me. Your mileage may vary.

EDIT

The correct combination is:

Ctrl + Alt + Shift + End