White noise isnt playing at all

Our child enjoys sleeping with the nanit white noise, but suddenly it has stopped working. Room sound/audio is fine but it wont play any whote noise.

The app says its playing it but no sound.

We have reinstalled the app (both andriod and apple). Removed the camera from the stand for 10 mins and placed it back on. Switched it off the mains for 10 mins. Switched wifi. Restarted wifi. Reatarted phones.