Try performing a general axisymmetric analysis of the model. This analysis behaves like a 2D-axisymmetric analysis with additional DOF for bending and torsion.
I recommend watching this AIC video to understand how to convert 2D to 3D models.
In MAPDL, use Plt Ctrls>>Style>>Symmetry Expansion>>2D-axisymmetry as an equivalent command to symmetry option in WorkBench.
Other help links:
Performing a 2D to 3D Analysis
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