Hi, Jack.
The error you’re experiencing when trying to add product/price to your invoice is due to a browser issue.
To resolve this, we can start by refreshing your browser. You can also try processing this in an incognito or private browsing window. If the issue persists, you can sign out of your QBO account and sign back in. Once you’re back in, try adding product/price to your invoice.
Also, ensure you’re using a supported browser, such as Google Chrome, Edge, or Safari, when accessing QuickBooks Online.
Let us know if you have any further questions or need assistance with QuickBooks. The Community space is available 24/7.
