Person at door can hear me but I can’t hear them

Hi I have a s220 door bell. I have an audio issue. The person at the door can hear me but I can’t hear them. My wife and son have the same issue. I have checked the audio settings and all are on and turned up? It did work but has just stopped working. Any help would be appreciated. Thanks

Sorry I’ve managed to sort it. I asked my son to hold the doorbell button, then talk into it and it has started working again. Strange as the delivery driver pressed the door bell only yesterday and he could hear me but I could not hear him.