Cash app won't let me add cash what are the reasons behind it? Want to get the reasons why you have been restricted by the cash app to add cash to your account then it is the best place to know. Here you can know why you have been restricted by the cash app to add cash to your cash app account you just have to click this link and you will know why. https://www.emailsupport-contact.com/blog/why-cant-i-add-cash-to-my-cash-app/