I have the same issue. I have to play a local 24/192 track prior to opening Amazon Music in order to get hd/ultrahd rates.
It is an issue related to the app itself. If the third-party app does not start playback first, the underlying will use the sytem default parameter 192k when using Amazon Music app. If the third-party app starts playback first , the underlying will use the previous parameter to set track if you turn on the Amazon Music app after that.
Best regards
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