It doesn't seem to activate when I try the levitation beam. I think, in fact I know that it is, a conflict with the animation mods I use. I am wondering if there is a way to allow it activate without having to disable the animation mods.

I just used the no clipping command (tcl) to run up the tower. Though Neloth is unable to levitaite down, but it doesn't mater as he appear outside the tower once you go out.