How to fix Cash App unable to login error? Cash App users often ask How to fix Cash App unable to login error. Well this error can occur due to many reasons which include technical glitch, network error and server down problem. Cash App unable to sign in on this device can be because of out dated version of your device or your device is filled with lot of cookies which needs to get deleted. If you are still unable to sign in on this device cash app then you must contact Cash App Customer support for the assistance. more information visit us our blog: https://squarecashelp.com/blog/cash-app-unable-to-sign-in-on-this-device