No Sound

Hi, This is the first time for me to try lip syncing. I added the audio and when I preview it, the audio and lips are synced pretty good. But when I render the scene there is no audio.
After I click the Animation button it goes through the whole rendering process but no sound.
What am I doing wrong?

In the render properties panel twirl down the Encoding menu. Choose an animation codec like h264, then in the Audio section choose an audio codec like AAC or MP3 etc.

Or choose a preset from the top of the encoding panel.

Thanks for your help !!