SharedContactApp API for google apps script

Question

All

I have a google apps script to create a shared contact in a GSuite domain.

  Logger.clear();
  debug("Begin createSharedContacts");
  var rangeDataValues = SpreadsheetApp.getActiveSheet().getRange(dataA1notation).getValues();
  var sharedContact = null;
  var sharedContactCustomField = null;
  var sharedContactAlt1EmailField = null;
  // loop trough all data, but process only the ones with a StudentNr
  for (var i = 0; (i < rangeDataValues.length) && (rangeDataValues[i][0] != ""); i++) {
      var rangeDataValueRow = rangeDataValues[i];
      sharedContact = SharedContactsApp.createContact(rangeDataValueRow[1], rangeDataValueRow[2], "[email protected]");
      sharedContactCustomField = sharedContact.addCustomField("Stamnummer",rangeDataValueRow[0]);
      sharedContactAlt1EmailField = sharedContact.addEmail(ContactsApp.Field.HOME_EMAIL, rangeDataValueRow[8]);
      debug(Object.prototype.toString.call(sharedContactAlt1EmailField));
      debug(JSON.stringify(sharedContactAlt1EmailField));
      sharedContactAlt1EmailField.setDisplayName("("+rangeDataValueRow[6]+") "+rangeDataValueRow[7]+", "+rangeDataValueRow[6]);
      SpreadsheetApp.getActiveSheet().getRange(i+3,5).setValue(sharedContact.getId());
  }
  debug("End createSharedContacts");

When I execute this peace op code I get the error:

TypeError: Cannot find function setAsPrimary  in object [object Object].

Any input on how to solve this.

Kind Regards Olivier