Unable to select PW and thus play in Node 5 of Avacyn's Madness

Duress

I've played and completed games twice in nodes 1, 2, 3, & 4 of this event and yet when I try to "Choose a Planeswalker" so I can build a deck and play I cannot do so. It is as if the button cannot be clicked or tapped. I have tried on both my Android device and an Android emulator on PC.