Update a record in Zoho creator that is a lookup field

Firstly I have tried to reach out to Make support but the person currently assisting cannot grasp the issue.

I have a form in Zoho Creator, this form has a lookup field on it.

I am trying to use the Zoho Creator: Update Record module to update the record and set a value for the lookup field.

Apparently, Make support says I should use the lookup record display_name or display_value, however, this fails with the below:

I then checked the Zoho Creator API docs and it says I should use the ID of an existing record that the lookup field refers to. I did this as well and got the same error.

Can someone please assist me?