I can see that there is more than 30 days of interaction data for a constituent, under the Interactions tab in the Constituent360 record. Why can I not return more than 30 days of data when running an Interactions report?
You cannot configure an Interactions report to return more than 30 days of data because such a report might cause performance issues on the system. Returning interaction data for multiple constituents and a relatively long date range builds a query that might run for a substantial amount of time. In the worse case, this report might not finish.