Fun App, game sound not working – Nick Jr - Watch Kids TV Shows Review

My 4.5 year old really likes the videos and the games. However there is no sound on the games (the videos are fine). I’ve deleted and re-installed the app a number of times to no avail. There are no settings within the app to address this. Causes frustration when my son doesn’t know the game instructions.
Review by LMCT2468 on Nick Jr - Watch Kids TV Shows.