I'm trying to extract from from Microsoft Graph the last time a specific account was used in azure. I'm doing this using signInActivity and while lastSignInDateTime does reflect the data I can see on the AAD portal, lastNonInteractiveSignInDateTime gives me "0001-01-01T00:00:00Z".
To be clear, this particular account shows plenty of non-interactive sign in events in the AAD web console. Is this feature not implemented yet or could there be another reason why this field is not geting updated?


