As a new seller who registered to sell on Amazon on or after 15th August 2016, you are subject to the Estimated Delivery date reserve.
The money you make from a sale will be held in your account for at least 7 days after the estimated delivery date of each order. Then, it will be added to your available balance and disbursed at your next scheduled settlement date (usually takes 2 weeks).
This is a permanent feature. And there is no option to appeal this “Payments based on delivery” disbursement schedule.
Also, Amazon will not release the funds earlier, despite they state in the Help Pages that they will consider the actual date of delivery.