So just got a new phone and now when I send invoices using the app they show up at the customer's end as duplicates. Any ideas how to change this? Thanks.

Hi damianpeace,

Let's perform some troubleshooting steps to get this issue sorted out. We can clear the apps' data to remove the stored cache. This can cause unusual behavior in the system.

For Android phones:

1. Login to Mobile App (QuickBooks).
2. On the top right, click the 3 dot/lines and select Settings.
3. Scroll down and select Refresh data.
4. Click Yes.

For Apple phones:

1. On the home page on your Mobile App, select burger icon (three horizontal lines) located on the top   left.
2. Select Help & Feedback.
3. Select Refresh Data link.

If the above step does not resolve the issue, please uninstall and download the app again. Reinstalling the app ensures that you're using the latest version and willl help get you back to business.

Once done, you can try to create a dummy invoice and sent it to your personal email to see if you encounter the same behavior. 

Please feel free to leave a comment letting me know how things go after giving this a try.