It means you're not following the correct procedure if you're unable to add money to your Cash App. First, make sure your bank account balance is sufficient, and then make sure your Cash App is updated and you're connected to the internet.
Add the desired amount to your Cash App balance after entering the correct information. If everything is in order, run Cash App. Access 'My Cash' and enter the amount there. Confirm the transaction by entering the PIN or by using Touch ID. Cash App will add the amount to your account.
https://cashapphone.com/blog/a....dd-money-to-cash-app