When I login with a username with underscore (name_surname) groups are not mapped. If I add groups to the user manually in mediawiki, the user will be removed from all of them after a new login.
Surely I could prevent this with 'locally-managed', but that is no real solution.
With a username that has no underscores all works fine.
php LDAPProvider/maintenance/ShowUserGroups.php --domain ad-domain.com --username wikiuser shows all the groups when I use name_surname. But obvously nothing for "Name surname".
It seems that name_surnameist changed to "Name surname" after login and LDAPGroups queries the Active Directory with that username.
How can I tell the extension LDAPGroups to "normalize" the username to name_surname before querying the groups?