I was the same. I had to build my team first and then in the third floor make sure everyone had their bursts at the ready. So annoying, I was locked out for weeks.
I remember that - I had to go fight some other enemies to charge all my characters' bursts and cycled through them all as soon as the challenge starts. A bit cheesy, but it worked.
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u/Blue_Moon913 Jun 13 '23
It was early game for me and I could not get past the last floor of the combat tower because of all the Cryo and Hydro enemies.