OWA timeout (5 mins instead 6 hours by default)

Question

Hello everybody! :-) Need some help with OWA timeout - I changed the settings but still no effect: ------before changes---------- C:\Windows\system32>Get-OrganizationConfig |Fl Activity* ActivityBasedAuthenticationTimeoutEnabled : True ActivityBasedAuthenticationTimeoutInterval : 06:00:00 ActivityBasedAuthenticationTimeoutWithSingleSignOnEnabled : True

Set-OrganizationConfig -ActivityBasedAuthenticationTimeoutInterval 00:05:00

after changes-------------------
Get-OrganizationConfig |Fl Activity*
ActivityBasedAuthenticationTimeoutEnabled : True
ActivityBasedAuthenticationTimeoutInterval : 00:05:00
ActivityBasedAuthenticationTimeoutWithSingleSignOnEnabled : True
But after all of these changes if I go to the mailbox through OWA, after 5 minutes I am not thrown out of the session (as it should be). Tel me please, what else shoud I check? Thank you.