A decent amount of people are having this problem. Here is a thread about it. Kabam is aware of the bug, but since it’s the weekend I don’t think it will be looked at until Monday.
I’m also having the same problem. But now for all of my choice rewards now I can not collect those either since the 6* deathless piece claim button was hit.
Same problem. I also send a ticket, but as I see here they are aware. I hope the can fix soon so I don't have that disturbing dark flashing second each time I change from one screen to another til March.
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https://forums.playcontestofchampions.com/en/discussion/388596/thanos-reigns-deathless-piece-selector-not-working/p1