Windows Sleep command does not work

[Lamda-Operations]

Describe the bug

When clicking on the clamshell, then Shutdown..., and then selecting "Sleep", windows goes dark as if the laptop is going to sleep, but even closing the cover the laptop does not sleep but continues to run. The only way i've found to put it to Sleep is to enter the Lock screen, and select the Power icon at the botttom-right, and then select Sleep which then happens nearly instantaneously.

Area of issue

Start menu

To reproduce

(see above for the steps)

Expected behavior

The laptop to enter Sleep mode

Open-Shell version

4.4.191

Windows version

Windows 11 Pro 23H2

Additional context

Edition Windows 11 Pro
Version 23H2
Installed on ‎4/‎18/‎2023
OS build 22631.4460
Serial number PF4C381J
Experience Windows Feature Experience Pack 1000.22700.1047.0

[ge0rdi]

Do you have modern standby enabled on your machine?
Could you post output of powercfg /a command?