You must have put a zillion spaces in you post. It is full of empty space.
I own an HP Spectre x360-13t-ap0xxxx ultrabook and that function is not there either.
Our keyboards should be pretty much the same.
For the sake of notebook mobile battery usage, HP seems to have decided to remove the timing feature that was present in the notebooks about four or five years ago.
Here is my workaround.
With your finger find the upper most left key in the dark and count six keys over to the right and give it a tap. That should bring the backlight to life.
Otherwise, just tap any key on the keyboard once. That works on my Spectre 13, if the backlight is off, as well.
I am not an HP Employee.
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For laptops or desktop PCs, use the Fn+Esc keystroke while logged into Windows to locate the Product number (SKU)