No sound from local video source

At the Audio Mixer: click the cog wheel icon and go to Advanced Audio Properties. There Audio Monitoring for the video source probably is set to Monitor Off. If you want to have it in your recording and hear it through your headphones, select Monitor and Output.

Output = sound going to your stream and/or recording
Monitor = sound for the OBS Operator, you behind your laptop

When using both speakers and a microphone at the same time and place, be careful to avoid feedback loops. That's why Monitor Off isn't a strange default value.
 
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