You are receiving the below error message when attempting to publish an invoice.
Feature Not Supported Error : We're sorry. This feature is not included in your QuickBooks Online Simple Start subscription.
QuickBooks Online integrated companies.
This error shows on your invoices when your QuickBooks Online subscription is on the Simple Start plan.
In order to publish these invoices, you will need to upgrade your QuickBooks Online subscription.
More information on the AutoEntry features included in each QuickBooks Online subscription level can be found here.