docs: public DbxClientV2 asMember(String memberId) {
          if (memberId == null) {
              throw new IllegalArgumentException("'memberId' should not be null");
          }
  
          DbxRawClientV2 asMemberClient = new DbxTeamRawClientV2(
              _client.getRequestConfig(),
              credential,
              _client.getHost(),
              _client.getUserId(),
              memberId,
              null,
              null
          );
          return new DbxClientV2(asMemberClient);
      }