I never really used this function myself. But with a sample block collection I can't get it to work either. Potentially it's bugged.
Somebody had contacted me several years ago about something like this and sent me some block samples.
I came up with my macro "SCR_PointBlock2Point" which is included in my public GitHub repo https://github.com/RonnySchneider/SCR_Macros_Public
The only thing it expects is that the point number and elevation are in different layers inside the block.
