Question on Portal surfaces

I was looking into that last night but found that it only caused a black screen.
I’m not sure why that is but after some testing I just couldn’t seem to get that working.

I’ve got a few ideas on what I need to do to get my current method working, it’s just learning how to go about doing it.
Do you know if it’s possible to change a camera FOV through blueprints at all?
I’m thinking that I’m going to need to change the FOV based on how far away from the door the player is as well as moving the camera.