Unable to add expense error code 6000

To help us look into this, could you let us know where you get the error message? Is it on a web browser or the mobile app? Any additional details you can provide will help us resolve your concern quickly.

In the meantime, let's take some troubleshooting steps to refresh your data and eliminate any temporary glitches:

• If you are using a web browser, log in with an incognito or private window, or try a different browser.
• If you're using the mobile app, follow the iOS or Android steps in this guide: Fix common issues in the QuickBooks mobile app.

After completing these steps, restart your device and reopen the QuickBooks Online (QBO) mobile app to check if the issue has been resolved.

I'll keep this conversation open for any follow-up questions or updates.