Good day, martin21.
To isolate this, let's ensure that the QuickBooks Online (QBO) Mobile app has permission to run in the background while your phone is using data.
Here are the steps:
If the problem persists, update the app by following these steps:
See the Android mileage tracking troubleshooting guide article for further guidance.
Then, try tracking your trips.
Let me also share this link for future reference: Fix Mileage Tracker for your iPhone.
Leave a comment below if you have any other concerns. I'm still here to help. Have a great day.