A problem in the interface of the app can be the reason for Cash App won’t let me send money is being appeared. To avoid seeing the message you can use the help spot or you can get the trouble settled by completing tech plans from the consultancies. You can also try watching some support vids that can help in resolving the glitch from arising. https://www.email-contactsupport.com/blog/cash-app-wont-let-me-send-money