This discussion has a screen snapshot of how to add keyopts to a body.
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I don't know what your model looks like.
- Is it 2D or 3D?
- If it is 2D is it Plane Strain or Axisymmetric?
- If it is 3D is it meshed with Tet element shapes or Hex element shapes?
- Is the Element Order set to Linear or Quadratic?
Each of those choices changes what Element Type is assigned to the elements.
After a Solve, the Solution Output shows what Element Type was assigned.
Different element types have different keyopt settings.
Look up the element type in ANSYS Help > Mechanical APDL > Element Reference > Element Library
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