Sound of the TV while doing a Skype call is output to different speakers even when a sound bar or audio system is connected.
Sound output while on Skype
This happens if the sound bar or the audio system does not have an Echo Canceller Sync function. You can either place the speaker farther away from the TV or turn down the volume of the TV to resolve this issue.
NOTE: Echo Canceller Sync is a function that helps minimize the chance of the sound being output to different speakers.