Soundcard overlay not working

Hi, I’m new to working with OSMC and I’ve been trying to set up music player using the raspberry pi zero and a justboom DAC zero pihat. There is am option for this Soundcard overlay under hardware support, however whenever I try to change to this setting, it isn’t saved. I have tried to add to the config files as specified on the justboom website, but this also doesn’t appear to be working. Any help would be greatly appreciated.

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