Can yall help me figure out how to sync my step count?

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I've got an iphone and I've got the Health app tracking my steps with a separate tracker, but Myfitnesspal only imports steps from the iphone's built in tracker. I've got permissions set for Myfitnesspal to read step data from Health, but it just... doesn't. I've contacted support, but they're light staffed for the holiday weekend and I'd like for my apps to be usable over the holiday.