Scratchard 'scratching place' won't open

I suppose you all heard about the new memrise contest. It will come to an end today. I got a notification saying scratch your last card by completing a lesson. I opened app as usual and got a pop-up. I did a general study and the scratching place didn’t show up? I then completed a section, and still nothing. Could someone please help? This is important for me since it keeps me motivated. And this time scratch card will give twice as the points I got yesterday. What should I do?

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