Spotlight Pro refurbished -- no sound

Hi, I purchased the refurbished spotlight Pro cam on the Black Friday in 2022 and it was sitting in the box unused until I installed it yesterday. Since the installation there is no sound neither on the recorded videos nor on the live view. I tried to restart the device through the app, nothing changed. The firmware is up to date and the WiFi signal is decent (RSSI-67). Other cameras installed even further from the router work with no issues. All sounds which could be heard are crisps and ticks. Any help to resolve the issue is appreciated.