Hi,
We highly recommend using the Allo GUI image, which allows for easy selection of bitdepth outputs on various software:
https://dietpi.com/forum/t/dietpi-allo-com-web-gui-image/1523/1
If you are using this image already, please can you confirm, in the web interface:
- Software you are trying to use
- 24 bitdepth is set for those required applications, in the web interface (eg: squeezelite/mpd/shairport-sync)