Why can't I issue an invoice from the app?

Let me provide some details on this invoice issue on the app, Office.

We have an ongoing issue about not being able to create invoices when using the mobile application. Our engineers are already working to get this fixed as soon as possible. 

As a workaround, you can use your computer while working with your invoices. At the same time, you can contact our support team to include you on the list as one of the affected users. This way, you'll be notified once the issue is fixed.

Additionally, learn more on how you can receive and process payments online, check out this article for more details: Receive and Process Payments in QuickBooks Online with QuickBooks Payments.

Feel free to let me know if you need additional assistance when creating invoices using an app. The Community is always here to cover your needs. Have a nice day!