I have all the requirements to upgrade Five'star counter attack to level 4, which costs 3 tier 1 ability tokens and even tier 2 ability tokens. I have more than those requirements and my Fives is level 43, but the Upgrade button is greyed out. Is this a bug?
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I had this happen to me. The 3rd tier mats for ability upgrades is completely hidden if you don't know already know its there