Hi,
If you have Database access, you should be able to change the “last_run” value in the “aor_scheduled_reports” table.
If you don’t, then you could perhaps create a Workflow to set “last_run” = “date_created” on the creation of Scheduled Reports records, that should ensure that “last_run” is not NULL for any new scheduled reports records
If you do the above, do the reports run?