code: def lookup_subjects(self, subject_lookup):
          
          content = self._serialize.body(subject_lookup, 'GraphSubjectLookup')
          response = self._send(http_method='POST',
                                location_id='4dd4d168-11f2-48c4-83e8-756fa0de027c',
                                version='5.1-preview.1',
                                content=content)
          return self._deserialize('{GraphSubject}', self._unwrap_collection(response))
docs: LookupSubjects.
          [Preview API] Resolve descriptors to users, groups or scopes (Subjects) in a batch.
          :param :class:`<GraphSubjectLookup> <azure.devops.v5_1.graph.models.GraphSubjectLookup>` subject_lookup: A list of descriptors that specifies a subset of subjects to retrieve. Each descriptor uniquely identifies the subject across all instance scopes, but only at a single point in time.
          :rtype: {GraphSubject}