logging out with/without confirmation - single site, multisite
I have two wordpress installations: a single one and a multisite with subdirectories. On both my users can logout with the url:
[URL to]/wp-login.php?action=logoutredirect_to=%2Fmydir%2F_wpnonce=[some_code]
This works on the single site without confirmation, but on the site within the multisite it doesn't. Here the user needs to confirm the logout.
How can I bypass the confirmation?
Thank you.