Mobile Cant use demon heart

I cant use demon heart , even I create a new character , the new one cant use either.
Is it a bug ?
Are you in hard mode when you are trying to use it? And are you in an Expert or Master world (or in a Journey world that has the difficulty set to Expert or Master)?
 
I was having the same problem. You need to make sure that time isn't frozen. I'm guessing you can't use it until the world has changed to hard mode, and that doesn't happen if time is frozen when you defeat the WoF.
 
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