I'll provide some basic troubleshooting steps. We need to ensure that the app is updated and that the latest version works with your device. The software also keeps cache files, occasionally resulting in a strange response from the system. Let's clear the app's cache by doing the following steps to start:
In the QuickBooks Online app:
Android: From More Options ⋮, select Settings, then select Refresh Data. Then, tap Yes.
iOS: From the Menu, ☰ select Help & Feedback, choose Refresh Data, and then select Refresh.
In your device Settings:
Android: From your device's Settings, select Apps (varies by device), choose QuickBooks app from the list, and then tap Storage. Finally, hit clear data.
iOS: From your device's Settings, select Setting General iPhone Storage and choose an app that takes up much space. To free up the Storage without deleting the documents and data for the app, hit Offload App.