Missing Polkit Agent for GPU Screen Recorder?

Hi! I installed the new Flatpak for GPU Screen Recorder, and the option for installing the Shadowplay-like UI gives an error about not having pkexec installed (I do) or a polkit agent running.
Any ideas how I may fix this? I seems to just need to prompt for root password. I tried running the flatpak as sudo just for the installer, but it ends up erroring out about not finding the GPU.
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