That depends on whether you're using desktop keyboard layout or laptop layout, but I'll list desktop first, laptop second:

Left Click      NumPad Slash         CAPSLOCK + NumRow 8
Right Click    NumPad Star           CAPSLOCK + NumRow 9

Emulated mouse clicks are inconsistent as far as when they do and do not work.  I always advise my clients to use the real buttons, whether on a "hobbled mouse" (you tape over the optical port on the bottom so the mouse pointer cannot move when it's touched/moved) or a masked mousepad, where the trackpad portion is covered with a rectangle of cardboard so only the left and right mouse click keys are available.
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Brian - Virginia, USA - Windows 10, 64-Bit, Version 21H2, Build 19044  

Puritanism: The haunting fear that someone, somewhere, may be happy.

    ~ H.L. Mencken, AKA The Sage of Baltimore

By the way, you can use the applications/context menu key if your keyboard has one, or SHIFT + F10 for right click and it's consistent in a way that the screen reader emulated version is not.
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Brian - Virginia, USA - Windows 10, 64-Bit, Version 21H2, Build 19044  

Puritanism: The haunting fear that someone, somewhere, may be happy.

    ~ H.L. Mencken, AKA The Sage of Baltimore