My app won't send invoices via email.Any idea why

I'm here to share some information to help fix and ensure you can send invoices via email, @andy129.

There are times that the browser is full of frequently accessed pages, thus causing some unusual responses. 

First, clear the app's cache files. Doing so helps in fixing any sorts of errors in the system. Then, follow the steps below if the issue persists:

• Restart your phone and launch again the app.
• Update your phone's operating system.
• Uninstall/reinstall the app.

I also suggest using a browser to access your QuickBooks Online account. From there, you can have the alternative to send your invoices via email. For detailed steps, please check out this article: Create and send invoices in QBO.

Additionally, here are some articles you can utilize to help manage your invoices in QuickBooks:

• Record invoice payments in QuickBooks Online
• Send invoice reminders automatically or manually in QuickBooks Online

We're always here to help you further if you have additional questions sending invoices or QuickBooks. Just leave your reply below. Have a great day!