For any issues with your App Gallery product itself, or for advice on how to get the best results from its integration with MyFitnessPal, your best resource will be the support options offered by that partner.
The support team at MyFitnessPal will be happy to help with any issues relating to the movement of data between our partners and MyFitnessPal here, but issues with specific devices and apps are best handled by the teams who know those products best.