Windows 10: Unable to enable Number pad in Ergonomic 4000 keyboard

I am trying to set up my Ergonomic 4000 keyboard but I cannot work out how to activate the number pad. I have tried the number lock key but that is not having any affect.




***Modified title from: Ergonomic 4000 keyboard***

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Microsoft Ergonomic Keyboard 4000

Hi,

I have purchased the Microsoft Natural Ergonomic Keyboard 4000 and the buttons at the top right, above the number pad, the "=", "(" and ")" are not working. This is actually the 4th keyboard I've purchased for my office and only one of the keyboards has
had these buttons work. Two of the keyboards which those buttons do not work have been purchased in the last couple months and they keys never worked out of the box. Is this a driver issue?

Thank you,

Kris

 

ergonomic keyboard 4000 instruction manual

Hi, it's the microsoft ergonomic keyboard 4000

 

manual for microsoft ergonomic keyboard 4000

Is this the document(s) you want? -
https://www.microsoft.com/accessories/en-us/products/keyboards/natural-ergonomic-keyboard-4000/b2m-00012#techspecs-connect

Hope it helps, if not post back.