Using hot reload / live coding? if so, don’t.
There are a few things going on in your project. FOV is as far as I know controlled by the player camera manager , which is a class you can get a reference for from the player controller. If I set the FOV there, all my cameras update.
For the camera not following your pawn: Is the camera attached to the another component? Else it will not get a relative position. Is the camera spring arm set to interpolate super super slowly?