I have found solution for my question, Acutually internally logout get request called when logged out from Azure-myapps, problem is on my end my application used same-site property as Lax so on myapps get-logout request new session launch(because browser blocked cookie reason cross-site request) in our-application and because of that request can not able to perform logout logic on behalf of the logged user.
I have prevented this problem by using centralized entity for user when logout-request come we will find the user based on nameID in saml-request and mark it as Logged out.