If you want to know the possible reason of Cash app won't let me send money, then you must prefer this online website. Actually, there are various valid reasons that can clog you to make payment. And, the reasons are like you lack proper internet connectivity, you don’t have enough balance in your account, you entered the wrong card number, entered the wrong details of the recipient, etc.

https://www.email-contactsupport.com/blog/cash-app-wont-let-me-send-money