Prestressed explicit dynamics analysis is only available to 3D. Please refer to this page on the Ansys Online Help: https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v201/en/exd_ag/exd_ag_prestress.html
Alternatively, you may try giving your model a small thickness (making it 3D) and constraint the out-of-plane movement to represent a plane strain case.
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