For a non-Archimedean locally compact field F of odd residue characteristic and characteristic 0, we prove a conjecture of D. Prasad predicting that, for an integer n ě 1 and a non-split quaternionic F -algebra D, a discrete series representation of GLnpDq has a symplectic period if and only if it is cuspidal and its Jacquet–Langlands transfer to GL2npF q is non-cuspidal
Matringe et al. (Wed,) studied this question.