Classification of $(\widetilde{Sp}(n,\mathbb{R})\times \widetilde{Sp}(1,\mathbb{R}))$-Manifolds

Let $M$ be an analytic complete finite volume pseudo-Riemannian manifold and $\widetilde{Sp}(n,\mathbb{R})\times \widetilde{Sp}(1,\mathbb{R})$ a connected semisimple Lie group such that its Lie algebra is $\mathfrak{s}\mathfrak{p}(n,\mathbb{R})\oplus \mathfrak{s}\mathfrak{p}(1,\mathbb{R})$. We characterize the structure of the manifold $M$ assuming that the Lie group $\widetilde{Sp}(n,\mathbb{R})\times \widetilde{Sp}(1,\mathbb{R})$ acts isometrically on $M$ and that its dimension satisfies $3+n(2n+1)<\dim (M)\le (n+1)(2n+3)$.