I've had this game for around six months now and I still can't get singleplayer to load up. I've tried nearly every solution I could find on the Internet and it still won't work. I'm running it on Windows 10 which seems to be the primary issue that other people are having with it.
Other than that, the multiplayer works fine.
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This might be a longshot that it will work for this game, but Battlefront 2 has a similar issue that can be solved by plugging something into the mic jack on your PC. It can just be a pair of headphones, or an actual mic, something just has to be plugged in.