Hello, ahensen.
Thanks for taking the time to contact the Community for support. I'd be glad to lend a hand with removing a third party app.
One other way to remove an app is to:
1. Login to https://apps.intuit.com.
2. Select My Apps.
3. Choose the QuickBooks Online company with the app you'd like to disconnect.
4. Click Disconnect under the app that needs to be removed.
This can also be done through the Apps tab in the left navigation bar of QBO.
Let me know how things go after giving this a try. I'll be here if you need help with anything else.