Huawei phones are Chinese devices and do not have Google Play Services, which is required in order for many apps to function properly, including Stamp Me.
Stamp Me is only available on the Google Play Store (and Apple App Store) and not the Huawei AppGallery.
Users with Huawei phones will unfortunately not be able to run the Stamp Me App successfully. We suggest that any members with Huawei phones are managed solely via your Merchant Console (and do not download the App) where you can create accounts, apply stamps, redeem rewards and more.