If you entered the wrong card number or CVV at the time of making any transaction, then you can see that the Cash app won’t let me send money. So, whenever you are going to make any transaction, then you need to ensure that you are entering the correct details and check it twice at least before hitting the Pay button. https://www.numbersupportcustomerservice.com/blog/cash-app-wont-let-me-send-money/