Cameras on Simulated proxies are not updated and typically they don’t even have cameras. Semantics says remove the cameras and all other non-useful components from sims on spawn.
For example my sims don’t have cameras or interactive collisions. They are removed via a begin play function. Sims are updated via simple data and smoothed.
What you need to do is use a “Spectator Pawn” or… Create another actor that has a camera component and attach that actor to a sim at the same socket the camera is. Then set view target to the new actor/spectator.