Cash App is a mobile payment service that allows users to transfer money to one another using a mobile phone app. Direct deposit is a feature that allows users to add money to their Cash App balance from their paychecks. However, sometimes direct deposit can fail, which can be frustrating if you're counting on that money to pay bills or make a purchase. There are a few reasons for cash app direct deposit failed, including an incorrect routing number or account number, a closed bank account, or a bank that doesn't work with Cash App.