Is it possible to use the created_user field in the instance name if it was not explicitly used in the survey? I want to be able to display that name in the Inbox.
You can only include in the instance name fields that are available in the survey. Those metadata fields are reserved field names and therefore can not be added to the survey to be visible like other fields in the feature layer.
I will look into it more to see if there is another way to do it using a calculation or pulldata expression.
Retrieving data ...