How does the above code map to the config?

The following works with my server:

import ldap3
server = ldap3.Server("my-ldap.ad.server.com", port=389, use_ssl=False)
conn = ldap3.Connection(server, user="my_ldap@ad.server.com", password="super_secret", auto_bind=ldap3.AUTO_BIND_NO_TLS)
is_bound=conn.bind()
conn.search(search_base="DC=ad,DC=server,DC=com", search_scope=ldap3.SUBTREE,search_filter='(sAMAccountName=bbloggs)',attributes=ldap3.ALL_ATTRIBUTES)
resp = conn.response[0]
print(resp['attributes']['cn'])
Blogs, Bill
print(resp['attributes']['uid'])
bblogs

My jupyterhub config is as follows:

auth:
  type: ldap
  ldap:
    server:
      address: my-ldap.ad.server.com:389
    dn:
      lookup: true
      search:
        filter: '({login_attr}={login})'
        user: 'my_ldap@ad.server.com'
        password: 'super_secret'
      user:
        searchBase: 'DC=ad,DC=server,DC=com'
        escape: False
        attribute: 'sAMAccountName'
        dnAttribute: 'cn'

I still get the following error:
ldapauthenticator:379] Invalid password for user bbloggs

can you please go thru the documentation and try it works for me.

https://github.com/jupyterhub/ldapauthenticator

can you please go thru the documentation and try it works for me.

https://github.com/jupyterhub/ldapauthenticator

Found it. It's all down to the templates - you need to get samples of several users from your target ldap and look at their dn entries.

Debugging this is quite hard, this code has no tests and a bare-bones main example.