Students will often comment that a specific pressure point they learned isn’t working. Typically, they assume that they are off in its location and sometimes they are. However, most of the time they are simply not “activating” it correctly. Some points need to be struck, some points need to be pressed and some need to be rasped to achieve the desired result. So, if a point isn’t working, try the other two ways of “activating” it and see if one of them works.
There is also the point that some people just don’t respond to pressure points. Others have exaggerated responses.