I want to make sure you're able to sync the QuickBooks Online app so you can easily view data, USV360.

Some additional troubleshooting steps include:

1. Changing the data connection on your device:

• If connected to Wifi, turn it off and use cellular data.
• If connected to cellular data, connect to Wifi.

2. Clearing the app data:

• QuickBooks Online app:
  - Android: From More Options ⋮, select Settings, then select Refresh Data, and then choose Yes.
  - iOS: From the Menu ☰, select Help & Feedback, select Refresh Data, and then select Refresh.

Check out the following article for even more details on Troubleshooting the QuickBooks Online app.

I recommend trying to uninstall and reinstall the app from your phone. 

Delete apps that you installed on an Android:

1. Open the Google Play Store app .
2. Tap Menu   My apps & games.
3. Tap on the app or game.
4. Tap Uninstall.

Delete an app from iPhone:

1. Launch the Settings app on your iPhone or iPad.
2. Tap General.
3. Tap [Device] Storage.
4. Select the app you want to delete.
5. Tap Delete app.
6. Tap Delete to confirm that you want to delete the app.

Once you have uninstalled the app, you can download it again from the iTunes or Google Play store.

There are a variety of third-party applications that works with QuickBooks Online (QBO) to help you run your business. If your users still having an issue with their access, you can contact them to report. 

In the meantime, you can find the right apps for your business by checking out this article: QuickBooks Apps. It groups them according to their categories like make payments, managing customers, prepare taxes, and sync data to name a few.

Please let me know how things look after giving this a try. I'll be here to help in any way that I can.