Please make sure QuickBooks integration is enabled on your account.
1. Go to Accounting tab.
2. The first time, you will be asked to connect to QuickBooks. Click on Connect to QuickBooks button. (Note: Once your account is connected to QuickBooks, all the existing categories will be disabled and new categories will be imported from QuickBooks.)
3. You will now be redirected to QuickBooks to authenticate your account. Click on Authorize to connect your QuickBooks account to Fyle. On successful authentication you will be redirected back to Fyle QuickBooks General Settings page.