Why can't I PRACTICE anymore?
For several days now whenever I click on the PRACTICE button, nothing happens.
I noticed that Duo app keeps crashing on my mobile. The sunday before last, I couldn't reach my target as the app kept crashing with only 7 xp left for me to reach my target. I had to use the laptop the next day and have since, as I notice that that issue hasn't been fixed. The app is still crashing, even today (24/09/18). I would advise you to use a laptop if you are using a mobile, maybe your issue will not occur on a laptop.
Have you tried different browsers and other versions?
Maybe any rolled out code update is not compatible with all browsers anymore?!?
Can you install Firefox on an iMac?
I have this problem too. On the desktop the practice button does nothing, on the app (android) I get an error message.
I often have this problem too. I find that it happens less if I have fast internet. It depends on the day.
Is there a console in your browser where any red error message is posted to?
In Firefox (on Windows) you can e.g open the developer console by pressing the F12 hotkey and scan for any red messages which contain any detail stack trace.
It would be better if you moved your thread to the Troubleshooting(English) sub-forum.
It has nothing to do with French (questions about the language or course).