For Uncoil to work properly to fetch the Facebook data, create ad to product attribution and to send one click actions to Facebook, Uncoil requires the top level permission of "Manage Ad Account" on each ad account.
To be able to set the permission in Facebook, follow these steps:
Go to https://business.facebook.com/settings/people/ and choose your business manager.
Click the user profile that the Uncoil integration is linked to.
Find the ad account within the account list and click to open it to display the current permissions.
Turn on the Admin Access, "Manage Ad Account" permission for the user profile and press save. Once that is complete, you should be able to integrate the ad account into Uncoil.