UseResponse provides access to your account from multiple devices, but you can't login simultenously under one account at multiple devices or at two browsers on one device at the same time.
Each time you go to another device to manage support requests you would be advised to login, unless you enter the system under another device.
Using your account by two different people is prohibited and would make either of you to be logged out simultenously when another user tries to authenticate at your account.
You can though use system with desktop and mobile interface conveniently
If you see that message "Someone has entered your account!" and being logged in, please use forgot password feature or change your password right in the system.