smr_fingers Change the price threshold back to 5p and toggle the Agile charge window to inactive and back again, you will see it picks your cheapest slots up OK.
When the rates come out initially, the schedules are not yet populated. They should be at 16:30. So this is likely just a timing thing.
Equally, the prepopulation runs at 22:15 and 23:15 too, and will populate active Agile charge windows where no slots have been selected yet.