Does anyone get an error message when trying to create an invoice from the QB app? I have uninstaled the app and re onstalled it but this doesn't help.

I appreciate you for trying to troubleshoot the issue in QuickBooks, @emacgray. When prompted to create invoices.

Since you uninstalled and reinstalled the QuickBooks App to resolve any unexpected behavior. Still the issue persists, I recommend contacting our QuickBooks Online Support team. They can create a ticket for further investigation and help you resolve the issue.

1. Sign in to your QuickBooks Online account 
2. Select the Help (?) icon at the top right. 
3. Type in your concern, then click Let's talk. 
4. Choose Contact Us to connect with a live support agent. 
5. Select Start a chat with a support expert or Get a callback from the next available expert. 

Also, I suggest checking out this article to help you enumerate the features supported by each device: Compare mobile app features.

Please feel free to post here again if you have any other concerns about creating your invoice. I'm always here to provide further assistance. Have a great day.