Legacy FEniCS does not support hexahedral meshes from file. You would have to use DOLFINx (and for instance meshio) to convert the mesh to an XDMF file that can be read by DOLFINx.
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Legacy FEniCS does not support hexahedral meshes from file. You would have to use DOLFINx (and for instance meshio) to convert the mesh to an XDMF file that can be read by DOLFINx.