Can you start the Swahili course yet because I tried and can't?
Yes. I can't access it on the app but it works fine in the browser for me. (Some people are not aware of this but Duolingo is not just an app, it's also a website.)
Yes, I have added it to my list and have done some lessons.
Yes, it just doesn't have sound yet.
Thank you to all who commented, it is working now but wasn't a while ago.