Unauthorised response when clicking save in data table

[jlowe-SFDC]

@jongpie I've setup the Data Table component in a screen flow to display a custom metadata type and configured it to be editable. The 'save' action kicks off a deployment and it is successful in the org. However, the table's loading spinner is stuck showing.

My org has the My Domain feature enabled. In the logs I can see "System.HttpResponse[Status=Unauthorized, StatusCode=401]" and in the browser console I can see "Malformed JSON: Expected '{' at the beginning of object"

From your guide, am I right in thinking that I don't think I need to do anything else in setup to authorise that connection?