When you can't add cash to Cash app? If you didn’t activate your card, then you can't add cash to Cash app card. And, one more thing, you also required to link a bank account with your Cash app account. You can use this card at any store, shop, online payment, that accepts Visa card. Along with this, you can also withdraw money with help of it. https://www.contact-mail-support.com/phone-number/square-cash