Salesforce Automation - Updating Records

Hi,

I’m trying to update Salesforce Records using the Beta automation. I was able to successfully create new records, but when I try to update records the automation test fails:

Salesforce reported an error while processing this action:
NOT_FOUND: Provided external ID field does not exist or is not accessible

I’m not quite sure what to enter as the Salesforce record ID. The Salesforce record type doesn’t have a primary key. Is that what’s causing the error or is the record ID something else?