Hello Farlamservice, that 00001186 error code is a sync glitch where your iPhone can't send that fuel expense to the cloud. It happens when the app's temporary data gets stuck, which is why it's blocking you.
When experiencing this kind of issue with the mobile app, you can refresh it by clearing the app data. This process helps remove any outdated files or cache that cause it to stop working as expected.
Since you're using iOS, go to Settings > General > iPhone Storage > QuickBooks Online app > Offload App.
After that, restart your device and log back into the app. If the issue persists, consider uninstalling and reinstalling the app or logging in to your account in the browser.
Let me know if you need anything else. I'm here to help.
