Hi charles-myatt-dr, thanks for posting on the Community
We're not aware of any issues with mileage tracking feature in QuickBooks Online currently.
Please uninstall and reinstall the app to the latest version available on your device and then review your device's location settings (following the steps on our guide linked here).
If you're continuing to experience issues following this, please get back to us below with the app version that you're using and the device type (iOS or Android).
