Is there a reason that you have not identified the notebook with its complete product name or product number (SKU)?
That always helps and is considered the norm here in the forum.
If I may speak candidly, that is usually the result of spillage of tea, coffee or soft drink on the keyboard.
Have you run the HP PC Hardware Diagnostic Utility tests on the keyboard? From power off, press the power button and immediately start tapping the f2 key to invoke the HP PC Hardware Diagnostic Utility. Click on component tests and then choose the keyboard test and run it.
Plug in a USB keyboard to see if it works. That will isolate the issue to the keyboard or a component on the system board.
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)