Same here. Any solution to this yet? It’s almost been two years since your post and now I have the same issue with the latest version of Harmony.
I followed the instructions from this document
and the spritesheet folder is just empty, as well as the few .xml files.
Edit: I’ve just created a new document, made a rough sketch with a very simple animation (rotation, scaling and bone rigging) just for testing purposes, and for any reason the spritesheet export does work this time (however, I haven’t yet tested the Unity import, but at least the export from Toon Boom seems to work). So apparently it only doesn’t work when using my existing animations.
I’d really appreciate some help.