Thanks Russ for pointing me to this direction. I was under assumption that this Classification worked with legacy SitaCatalyst integration (SC-TnT) - this is because I only see Active Dates as SC-TnT and not as Active Dates (Analytics for Target).
Let me chase CC for understanding where the issue is.
However, on my original query, can you please share an example of how you have created an Exclusion segment using end-date? Thanks,