Let’s run through a few troubleshooting steps to ensure that the mileage tracking feature is functioning correctly at all times,  @David.

First, we'll need to ensure that auto-tracking is enabled in the QuickBooks mobile app. Let me guide you on how to check it:

On iOS (iPhone and iPad):

1. Open the QuickBooks mobile app.
2. Click the menu ☰ icon and tap All.
3. Select Mileage and hit Auto-track your mileage.
4. Follow Allow location access on-screen instructions.

On an Android phone or tablet:

1. Click the menu ☰ icon.
2. Select Mileage.
3. Turn on the Auto-tracking switch.
4. Give QuickBooks permission to track your location. Select Allow. If prompted, tap Allow all the time.
5. If you are prompted to allow access to your physical activity, press Allow.
6. For Android OS version 11 and above:
   • For location permissions, select While using the app, then tap Ok (if prompted). Then click Allow all the time.
   • If you are prompted to allow access to your physical activity, press Allow.

Next, check the general location settings on your phone or tablet to confirm that the app can run in the background. You can follow the steps and details in this article: Fix mileage tracking issues in the mobile app. If the issue persists, follow the troubleshooting steps outlined in the provided article.

To learn more about recording business miles for one or more vehicles, refer to this article: Automatically track mileage in QuickBooks Online.

If you have any additional questions, please don't hesitate to reply. We're here to help.