Just opened my mobile app (use it everyday) and the invoice shortcut, in fact any mention of invoices, has disappeared. Help!

Hello there, accounts-mbzheat.

I'm here to help determine the issue about your invoices in your mobile app account in QuickBooks Online (QBO). 

To isolate the problem, let's try resetting the app data to clear the cache and refresh it into its default state. Here's how:

For Android devices:

1. From More Options, then select the Settings tab. 
2. Choose the Refresh Data menu.
3. Hit Yes. 

For iOs devices:

1. Go to the Help menu.
2. Select Reset App Data.
3. Click OK.

Once done, try to log back in and check to see if it works. If the issue persists, let's try to uninstall and then reinstall the QBO mobile app. 

To learn the features that are supported on mobile devices, check out this article: Compare mobile app features.

Let me know if there's anything else you need help when using QuickBooks Online mobile app. I'm always here to help you anytime. Take care and keep safe!