Is it possible to use hubspot_owner_id property in form submit via API?
I can’t add it to field list. Why?
hubspot_owner_id is not set up to be a form field, so it can’t be added to a form. That being said, you can still include a value for the field when submitting form data through the Forms API, even if it’s not included in the form settings. It may not look correct when viewing the form submission in the Forms app in HubSpot, but it should still update the value for the contact correctly.