If the user who originally connected Procurify and QuickBooks is no longer an active user in Procurify or QuickBooks, the following error message will appear. The resolution is to disconnect Procurify and QuickBooks and reconnect using an alternative user account. Refer to the following article for setup instructions: How to Connect Procurify to QuickBooks Online

There are four plans available for QuickBooks Online: Simple Start, Essentials, Plus and Advanced. The feature you are trying to access is not allowed in your current plan. Check price and compare to determine which plan suits your needs.