Tried on Samsung TabS and a BQ android-phone. None of them working. The mic is constantly "OFF", and "will be turned on in one hour" according to duolingo. I've tried switch it on manually, but neither way....nada-never. Extremely annoying

I never succeed in using the mic on any Android device (smartphone or tablet) with the latest is releases Kitkat and Lollipop, and I was thinking to be the only one! If you found the solution please let me know!!!

i tried to use this on a galaxy tab and it doesn't work. There seems to be some issue with flash not picking up the mic sound in android. I tried Firefox and the default chrome browser.

tries it on Kindle Fire HD and it does not give any speaking exercises so I assume it doesn't recognize the mic

Here's what worked for me: First, I had to give the Duolingo app permission to access the microphone, then I was able to toggle the Speaking Exercises ON in the app settings.