Lookup Threat Intel reports for selected alerts - ValueError: The truth value of a DataFrame is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all()

[reginatwopointo]

How to fix this code line giving a ValueError?

selected_alert_type['TI Risk'] = selected_alert_type.progress_apply(lookup, axis=1)

[reginatwopointo]

This is from a notebook called "Guided Investigation - Alert Triage."