You can clone with
HTTPS or Subversion.
Is there a plan for fixing it?
https://github.com/planetargon/open-build-service/commits/master - these guys are redoing the auth layer.
SUSE is not investing time in this feature atm. There is a rewrite sponsored by intel, but it got stuck as well. So, this will become most likely a known regression in 2.4 release.
OBS 2.4.0 got fixes from Intel for LDAP support, I suppose it works now.