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To single out the issue, let’s check if the Mileage feature is already activated on your device. Then, make sure the phone’s permission is set up properly.
Here’s how:
In your mobile device, tap the Mileage menu to select Auto-Tracking.
Next, move the slider to turn on the Auto-tracking option.
The steps to enable the location permissions depend on your phone. For detailed instructions, see the Track mileage in QuickBooks Online guide and then proceed directly to the iOS or Android section.