Across ubiquitous video conferencing tools like Zoom, FaceTime and Skype, it takes time for audio data to travel from person to person. That small delay, called latency, is mostly tolerable in conversation — save for a few overlapping stutters — but when it comes to playing music online with any kind of rhythmic integrity, latency quickly becomes a total dealbreaker.
Source: Playing Music Together Online Is Not As Simple As It Seems