Notification sound/ cant hear the ring chime options

Hi, ive just installed the ring 3plus. Ive setup the account, an once done shared user with my partner. When doorbell is pressed, i get a vibration - no sound alert. My partner gets a sound alert on hers though. While checking settings/volume etc- i attempted to change the alert noise, butni cant hear them either. But again, on my partners app, she can go through all of the alert tones, hear each one etc. Im running iphone 11pro - latest software, shes got iphone 8. Any advice? Regards Dan