[shaktoo]

One of the two: enable "Bypass HDCP" in InputStream.Adaptive, or download and setup playback to use the native app.

Bypass HDCP is ticked and let me have 1080p instead of 720p but no 4K.

Use amazon app give me a black screen

It stopped being possible to get 4k in the Kodi addon on the Shield some time ago. Not sure why. 1080 is the most you can get now, but at least you get proper audio (unlike the 'proper' Amazon app which only outputs stereo on the Shield). But you should be able to get the Amazon app working for 4k content (just with stereo). Basically Amazon on the Shield is a PITA these days - I have to use the TV's native app, and put up with their crap interface.

I do not have access to Shield 2019 and no 4K TV etc. But thats what I am building up to.
Please correct me if I am wrong : " Shield 2019 Pro connected to 4K DV /Atmos AV reciver and then sending all signals to 4K HDR/DV TV and one's 7.1.4 Atmos speakers Would this NOT get 4K HDR / DV /Atmos from Amazon VOD on Shield ? "
I know that DV is not playable directly via Kodi using Shield but via external player ( exo player ) or via Plex ( using exo-player ) 
We should be able to get uncompresssed passthrough ATMOS/ DTX etc directly via Shield  and AVOD ?