It doesn't always recognise speech.
Is anyone else having this problem? I am learning Norwegian (since I moved here to live with my partner) and whenever the "teacher" asks me to say a phrase and I repeat it it doesn't seem to pick up my voice even if I say it correctly three times.
I've had this happen in my German course. It used to work pretty well a long time ago, so I'm not sure what changed.
I simply disabled the vocal exercises in my settings and moved on. I understand that is not a solution, but Duolingo is limited anyway in what it teaches, so that worked for me.