I am not sure if i should ask the question I am working with Microsoft EntraID and its works well, not we have registered a post logout as: http://website/com/logout.cfm since we use app proxy and we have two urls which points to same wwebsite going from website.com adn other one as membersportal.com now, when logout, it goes to the website.com , and when it returns, i want it to detect if the call was made from which site adn should change the url to that url, how should i do it, i tried a lot but still not getting an answer, anyone knows how to fix it

you either need to be able to pass a return url value in a query string to the service OR you could try saving a cookie for which site the user is logging out of and setup both sites to check for that cookie and redirect the user to the appropriate one.