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Hello @vogue and good day to you.
There has been issue with this feature quite some time and the fix is still in progress. In the mean time, try disconnecting your device whilst still in the game, wait for several seconds and then reconnecting the device to the internet, play a level and go back to the tab event to see whether you are able to claim it.
If not, repeat the above few days later as it may fixes itself and go back to the grey box again.
If your game is not affected, just continue playing and check on the event tab occasionally for that event.
Good luck and keep playing 🙂