I’ve just done it in a new project, and I’ve just done it in the project you attached.
- Select music.
- Set tonality to 24 EDO.
- Type Shift-K (there’s no need to deselect or reselect anything before you do this).
- Type atonal.
- Hit return.
I’ve just done it in a new project, and I’ve just done it in the project you attached.