Duolingo reagiert nicht.....
Duolingo reagiert nicht!
There are lot of issues with the App in the last few weeks.
Make sure the App has synchronised with the web version after each lesson on the App. When that is not possible. Controle this at least before midnight. There are a lot of complains about "Losing streaks" and "Not registered XP". And have always the "Streak auf Eis: Ausgestattet".