Hi. No, I wanted to unlock the 3rd character's weekly challenges (Zombies), but I couldn't. I did complete the Plants' weekly challenges during the previous weeks. Both weekly challenges for Plants were completed w/o any issues. The Zombies' ones are still left.
You can't unlock it now just on every Monday in the afternoon
So this is how character challenges work in midday in Est-time Monday you get one key. Today is Saturday so you'll get it in two days. Right now everyone has two keys so you can unlock one every Monday
