Thanks for letting us know that you already tried refreshing the data within the app. I have another set of steps to recommend that can resolve common sync issues between the web and mobile versions of QBO.
Start by clearing you app data. There are two to clear and remove cached data. First is through the QuickBooks Online app itself. Here's how you can do this if you're using an Android device:
Go to More Options ⋮,
Select Settings, then tap Refresh Data,
Tap Yes.
If you have iOS, follow these steps:
Go to Menu ☰
Select Help & Feedback, then tap Refresh Data,
Tap Refresh.
Once done, log back in to your account and check if the customer data is already syncing. You might also need to uninstall and reinstall the app just in case the issue persists. Use this article as a guide on how to reinstall the app: How To Download The QuickBooks Online Mobile App .
Please let me know if you have other questions. We're always here to help.
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