CTRL+ALT+END inside RDP sessions (Inception)

Hi,

Key Combinations --> ENABLE (true, yes)
Send "Windows Button" --> OK
Send "CTRL+ALT+END" --> NOK

Impossible to send CTRL + ALT + (END) or (SUPPR) or (INSERT).

Computer : Layer 0
Context : I'm connecting with my computer on a virtual desktop with VMWare Horizon (Layer 1)
Then, I'm connecting to a RDP desktop (Layer 2)
And then, Connecting with MRemoteNG to RDP desktop (Layer 3)

I enabled key combinations, the "windows" key is working now, but impossible to do the CTRL + ALT + END (or SUPPR or INSERT).

When I do the next combinations :
CTRL + ALT + SUPPR : This is the Layer 0 (PC) who answer
CTRL + ALT + INSERT : This is the layer 1 (VMWare) who answer
CTRL + ALT + END : This is the layer 2 (rdp) who answer
Layer 3 : With Mremote NG Nothing works
Layer 3 : With RDP in the RDP : Nothing works

Work Around : launch "osk.exe" (virtual keyboard), do CTRL + ALT with the keybord, and "SUPPR" with the virtual keyboard

Could you add a button in MRemoteNG to send special key combination inside the RDP Session or it is impossible ? (it works with a microsoft tool like Remote Desktop Connection Manager (RDCMan), there is a button to send CTRL+ALT+SUPPR or other combinations)

Thanks you in advance