[rocko]

Curious, exactly today I noticed that, too. In the last weeks I didn't care because afaik Amazon reduced generally the resolution since the beginning of the Corona pandemie.
I heard that higher resolutions need HDCP which cannot be provided via KODI. Is that correct? Does it affect all platforms? I'm using macOS Catalina.
I tought that I saw 1080p movies of Amazon via KODi, but may I dreamt and it was in the browser - cannot remember exactly.

Meanwhile I just read all the posts, threads and hints to this topic. It seems that for nearly all Amazon contents the DRM restriction Level is that high, that the 'InputStream' playback configuration of the Amazon VOD Plugin can only play streams up to 540p. An alternative - at least on macOS - is to configure the playback mode to "Browser" which simply will open the choosen movie in a browser window which allows to play at least 1080p.

Using Browser is not a really good option, you miss the 5.1 audio...
@Varstahl: finally, we have a Windows 10 App. Is it possibile to use that, like in Android, to bypass the resolution limits?

Using Android,I can play only 480-540 movies. How do you play the 1080 videos even at 480 or 540? 1080 movies won't open for me. This is on Kodi Leia.