[calibos]

That might depend on a number of factors. The easier test is to disable "MPD alteration proxy" and trying again. Also you might want to read here in regard to AVOD and Android playback.

Disabled MPD. Also tried enabling 'Use Android app for 4K videos' in conjunction and in isolation from the MPD setting.

Same behaviour. Click the episode, Screen Dims, blue ring starts spinning. Playback Progress bar OSD at top of screen visible behind what looks like this deep tint/dimming overlay. Pressing Pause changes playback triangle to pause icon. Pressing stop immediately removes the dark tint overlay over the Kodi interface. 

I already have the Android Prime Video app installed and it works perfectly outside of KODI.