You must ensure that estimates are enabled on your account in order to pull data from Harvest into Hurree.

Easily access this by going to the account settings in the top right corner of your Harvest profile.

Scroll down to the section titled Modules.

These features are disabled by default on your account, but you can enable them by clicking Choose Modules.

Once in this area, tick the box next to estimates and save your changes.

You can now pass data from your Harvest account into Hurree.