There is no Add Device + option when I logined with customer account

get query of logined in user match logined Dear Friends, I am using VS2008,,c# web application When users are logined simultaneously, the session values are changing among users logined Problem Description cannot set photo in profile which is logined in clone whatsapp and shows white screen and when minimise the app and enter again in app

logined my gmail logined maybe another person device i do not know where login so please help me Details Account Access & Recovery,Web Locked This