Activating Portrait Effect in AVFoundation

I have an AVFoundation-based live camera view. There is a button by which I am calling AVCaptureDevice.showSystemUserInterface(.videoEffects) so that the user can activate the Portrait Effect. I have also opted in by setting "Camera — Opt in for Portrait Effect" to true in info.plist. However, upon tapping on the button I see this screen (The red crossed-off part is the app name):

I am expecting to see something like this:

Do you have any idea why that might be?

Activating Portrait Effect in AVFoundation
 
 
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