With the workaround i published here i could also fix this issue.
the code i run is:
Homey.flow.runFlowCardAction({
uri: 'homey:app:com.athom.soundboard',
id: 'play',
args: {
sound:{
id: 'ID',
name: 'name.wav',
athomId: 'athomid'
},
},
});
Greetings,
Volle yoghurt.