I've been at 36/50 for three days. Each day I have done at least 4 (Tiger) strikes, but the counter never moves. I'm not sure if there's something I can do, or if I'm just screwed. I'm pretty certain by now that I should have the upgrade/bonus (It's been stuck longer than just three days).
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An update. So doing strikes playlist (Tiger) wasn't giving me credit. Randomly tried selecting earth, Devil's lair level 8 strike. Each completion gave me 3 points toward the 50. Went and did a tiger strike again. Still at 50.