It seems that it isn't easy to handle aac/m4a files in sox anymore. Online help threads suggest using ffmpeg to convert it to mp3 instead:
ffmpeg -i input.m4a -c:a libmp3lame -q:a 8 output.mp3
Reference link: https://askubuntu.com/questions/1200430/how-to-convert-m4a-audio-files-to-mp3-use-command-line
This, after having installed lame, naturally. This I did via homebrew:
brew install lame
And homebrew itself, I installed via a ruby command:
ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null
All this on a Mac OS X 10.15.7
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