Sampling sets and closed range composition operators on the Bloch space

We give a necessary and sufficient condition for a composition operator $C_{\phi }$ on the Bloch space to have closed range. We show that when $\phi$ is univalent, it is sufficient to consider the action of $C_{\phi }$ on the set of Möbius transforms. In this case the closed range property is equivalent to a specific sampling set satisfying the reverse Carleson condition.