I read somewhere, that AMU and Tidal normalizations, work only if a song exceeds given max LUFS, lowering it and otherwise do nothing if a song is too low.
I tried for a month AMU and got the impression it normalizes nothing when alexa cast is used, in the same way how stream data and playing queue are not displayed but I could be wrong. Instead I'm shure normalization doesn't work with Tidal connect, that not even keeps play history and doesn't start autoplay after last song of a playlist.