Why can't my audio be heard when sharing video in Teams?

Teams meeting sharing video files with audio

When sharing your screen you may need to share audio, there are two ways this can be done. The first, pictured below, shows that after clicking on "share" you can then select the option to "Include computer sound", this will enable the audio while sharing your screen.

Alternatively...

When you share the screen, you'll need to place the cursor at the top of the screen and the toolbar pictured below should appear. You can uncheck the button highlighted that is in gray and labeled “Include system audio”.