Noob rigging question. I have a low poly rigged fbx (attached), brought it in to houdini, added a sub div to increase the poly count and re exported with defaults. Problem is when brought into the game engine, the bones aren't connected to the mesh anymore. I'm adding the SubDiv just before the BoneDeform SOP to bring into T-pose. What step(s) am I missing?

Try exporting as .abc/alembic instead. Rigging data I find is exported better that way.