Guillaume Laferriere

Look for hou.ChannelList.addGeometryChannels() in the hom documentation. It allows you to put the channel in the animation editor.
You’ll also need to call hou.playbar.setChannelList().

Ok, so finally I was able to fix the problem and export the animation properly.
I made a small video explaining the steps I had to do to fix the problem.
My initial feeling was that something was broken on the baking side, but it turned out the controllers were not properly driven by the animation.

Ah.. I think I understand why the export is failing.
The SceneCharacterExport is trying to export back on the Bone OBJs directly but the FK rig of simplemale is built to have the animation on the ctrl_FK_ prefixed OBJ nodes. I'll continue to try to fix your scene, but that information can help you progress on your own.