I appreciate you reaching out to the Community. I'd like to take a look into this and provide the support you need.
There's hasn't been any recent reports about the QBO mileage tracker not working. I'd like for you to do some troubleshooting on your end. I recommend uninstalling the app and reinstalling it. Doing this helps fix most issues the app may be having. If there's still something wrong with the feature after uninstalling and reinstalling, please elaborate on what you're experiencing so we're both on the same page.
Give this a try and if you're still having issues, I recommend contacting our support team using this link.
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