New Session not working in Open Browser


I am Working on a process where I am logging in a web portal then closing that portal without logging out and then again opening that same portal
Here I need when I am trying to open the portal for and time, it should be already logged in and for this i am marking “False” in “New session” property of open browser activity
But still Portal asks for login details everytime it opens the portal

Can anyone suggest a solution?


That could be website behavior once it is closed and reopen it may ask for credential.
it does not store last login session. everytime we open and have to log in to it.