Hi Pablo,
My name is Merlina, I am an Independent Advisor and a user like yourself.
Thanks for reaching out. I understand your question regarding enabling the keyboard on your HP EliteBook. I'll do my best to help you.
Please try holding the right shift key for 8 seconds to lock and unlock the keyboard or try the following: Use Shift + Fn (actually Fn + Shift, button-down-order seems to matter here) on HP EliteBook.
if the issue persists, I suggest contacting HP Support as they have the advanced settings for this concern.
I hope you have a great day! thank you.