Cash App Unable To Sign In Website:- https://sites.google.com/view/cashappunabletosignin/ Get the quick and easy set of instructions to fix the “unable to sign in cash app” error. Make sure you follow the steps in order to avoid errors. Slow and interrupted online money transfer services motivated Square Inc to introduce a user-friendly payment system. With the aim to give hassle-free, fast, and reliable services, the Cash App payment application came into play in 2013.