For those not able to apply the Rankup Gem that you want to use, you can submit a Support Ticket to Kabam and request WHICH ONE you would like them to apply to WHICH CHAMP, and they should be able to apply that correct one for you.
Other people have been successful in requesting this. Kabam is still looking at developing a better in-game method, but until then a Support Request is your best bet.
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Other people have been successful in requesting this. Kabam is still looking at developing a better in-game method, but until then a Support Request is your best bet.