Switch Port Reports for Unused Up and Unused Down ports are available in LMS 2.6 but not in LMS 3.0.
These reports are migrated, when you do local or remote data migration from LMS 2.6 to LMS 3.0.
If you have scheduled jobs for these reports, they do not run in LMS 3.0.
Workaround:
After upgrading to LMS 3.0, delete the scheduled jobs for Switch Port Reports on Unused Up/ Unused Down ports.