Please help! Error when trying to buy USPS shipping.

Description

FIrst, I have a bank account linked with plenty of funds, I have a credit card with available funds, I have over $100 AVAILABLE in my paypal account. with several hundred pending. this is a new paypal account. I get that they hold your funds until products reach their destination. BUT they released some of it. I have many orders waiting to be shipped. I try going to *ship* button, fill out the form. I then get an error code, saying I dotn have enough available and to link a card or bank. I cant reach customer service obviously. Does anyone know whats going on? I need to send these orders on Monday… Please let me know if anyone can help!