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In sage 9.0, I can execute:
sage: square = polytopes.hypercube(2)
sage: fl = square.face_lattice();
sage: list(f.ambient_V_indices() for f in fl)
[(), (0,), (1,), (2,), (3,), (0, 1), (0, 2), (2, 3), (1, 3), (0, 1, 2, 3)]
Which version of sage are you using? That might be a problem as the function ambient_V_indices is available since version 8.8.
