  It has been argued that generic classical perturbations to asymptotically
de-Sitter Reissner-Nordtsr\"om (RN-dS) black holes may violate strong cosmic
censorship conjecture. In this paper, we analyze whether quantum corrections
can restore the conjecture. We study a quantum scalar field in RN-dS geometry
and analyze the smoothness of a state across various horizons using the
criteria developed in arXiv:1910.02992. Since de-Sitter black holes have a
cosmological horizon, that typically radiates at a different temperature than
the event horizon, the existence of a quantum state which is regular everywhere
in the exterior region is non-trivial. We find such states for spherically
symmetric black holes in arbitrary dimensions. We then demonstrate that such
states are singular at the inner horizon of RN-dS black holes in various
dimensions. Hence, quantum fluctuations are sufficient to restore the strong
cosmic censorship conjecture in RN-dS.
