Just use the text input channel like you would do talking to alexa. Like „play blabla radio on tunein“ and it will work just fine
I know this is an old thread, but the work around seems to be to switch from using the radioStationId channel to using the textCommand channel (or playMusicVoiceCommand), but neither of these are supported to WHA (whole home audio). Does anyone have something that works for WHA?
Just in case someone pops in here again, using the textCommand on any device you can simply add ‘everywhere’ or the name of your audio group to the command (ie. ‘play heart radio everywhere’).
Tested, it works.