LDAP anonymous bind

I’m trying to configure authentication via LDAP. My understanding is that the manager performs an anonymous bind to the LDAP server

LDAP is enabled via GSA in the Administration - LDAP window.
The checks for Auth. DN pass and a correct certificate chain is uploaded.

From the GVMD log:

lib ldap: StartTLS failed, trying to establish ldaps connection.
lib ldap:warning: LDAP anonymous authentication failure: Protocol error

In my case anonymous binding is disabled on the LDAP server and cannot be enabled. Is there any way to perform a non-anonymous bind? I don’t see any options in the GSA. Or does any other version of GVM supports it?

GVM versions

gsa: Greenbone Security Assistant 9.0.0~git-ff857b53a-gsa-9.0
gvm: Greenbone Vulnerability Manager 9.0.0~git-a46996fe-HEAD
openvas-scanner: OpenVAS 7.0.0
gvm-libs: 11.0

Operating system: Debian Buster
Installation method / source: https://github.com/greenbone/