code: def bind(self):
          
  
          conn = self.initialize
          try:
              conn.simple_bind_s(
                  current_app.config['LDAP_USERNAME'],
                  current_app.config['LDAP_PASSWORD'])
              return conn
          except ldap.LDAPError as e:
              raise LDAPException(self.error(e.args))
docs: Attempts to bind to the LDAP server using the credentials of the
          service account.
  
          :return: Bound LDAP connection object if successful or ``None`` if
              unsuccessful.