APM logon page prompts again when logout from application

I have a setup where F5 placed as a ADFS proxy.When user clicks on signout in the office 365,it starts a signout process and request has been sent to the ADFS server.I have an issue where APM session is not getting closed.I m using below I rule.Kindly suggest if we have a better solution. when HTTP_RESPONSE {

if {[HTTP::header "Set-Cookie"] contains "MSISSignOut=;"} {

ACCESS::session data set session.user.adfssignout 1

HTTP::close

} }

when CLIENT_CLOSED {

Remove APM session if ADFS sign-out variable exists

if {[ACCESS::session data get session.user.adfssignout] eq 1} { ACCESS::session remove } }