The best way to contact app support using the cash app customer service number of the cash app is through the cash register app. However, tap the profile icon on the cash app home screen, select Support and go to the issue. For more information on how to contact the cash claim number. Please contact the cash claim support service and visit this website for more information. https://www.squarecashhelps.com/blog/what-is-cash-app-customer-service-number/