Make sure you have motion tracking turned on.
Go to your iPhone Settings > Privacy > Motion & Fitness and ensure it is turned on.
Please note that the Aglet app needs certain phone features in order to operate.
Compatible with iPhone® 7 / 7 Plus / 8 / 8 Plus / devices with iOS Version 11 or later installed.
Not compatible with 5th generation iPod Touch devices or iPhone 6S or earlier iPhone devices.