There will be issues with sound from the ESPN app if the volume on the streaming device is too low or is muted. Make sure the device is not set to silent or on airplane mode. An iPhone or iPad will have an orange light by the volume button if silenced.
If ESPN is not streaming on your Samsung TV, it could be that the app needs to be updated. To do this, press the ‘Home’ button on your remote control and select ‘Featured’ > ‘ESPN’ > press and hold the ‘Enter’ button and select ‘Update Apps’ > ‘All’ > ‘Update,’ then retry the app once more.