Proposing this new sodium arrangement within the fully sodiated cubic Prussian Blue compound is crucial, as the reduced sodium-sodium interactions enhance the accuracy and mitigate distortions that arise when structural optimizations are performed without constraints on the degrees of freedom. This finding is important for future experimental studies and in particular for future theoretical studies that calculate the phase diagram, simulate spectra, compare the relative stability of the rhombohedral and cubic modification or employ molecular dynamics simulations aimed at capturing the sodium diffusion mechanism within the system.