Simply stated - Microsoft Windows 10 includes a prompt to print the homegroup password. When you click on it, you get an error. This feature worked on previous versions of Windows. It does not work now, therefore it is broken.
I am sure all of us can figure out several ways to capture/print the password without using the broken feature. The reason for the original post was merely to point out that this feature no longer works, not to seek work-arounds. It would seem to be an easy fix, Yet, after several months it has not been fixed nor even acknowledged by MS. Some people (me included) find this puzzling and a bit frustrating.
The suggestion that it will work if you make IE your default browser is no****t even worth trying. It is just another work-around. MS keeps touting the Edge browser as the preferred browser for Windows 10.