Kerberos Authentication using SSO

Hello, if there is any knowing Nextcloud admins here I could use some help. I’m trying to set up Nextcloud with an LDAP backend using Kerberos authentication. So right now I’m looking at the SSO & SAML authentication plugin.

The documentation on the Nextcloud website specifies the following; “To enable that choose the “Environment variable” authentication provider in the application and then specify the environment variable. (e.g. REMOTE_USER for Kerberos)”

At this point I’m completely lost as I fail to find the Enviroment Variable authentication provider.

Any help is appricated.

Best regards