Why the boolean doesn't work?

[MikeyMopar]

@Anthony_Forwood

You have all sorts of modifiers on all your objects that you need to turn off first, and you’re trying to apply the boolean to them all at once. You can’t do that.

Only because the OP problem was solved am I interjecting here…This suggestion worked for my issue also using boolean modifier; existing modifiers not actually applied to the mesh shapes that were generated by an add-on before trying to perform a “union”. Banging my head against the wall for several hours trying to figure out why it wasn’t working correctly. Thanks!!