Shipments not being recognised in front end

When I create a shipment using the https://api.easyship.com/2023-01/shipments and then https://api.easyship.com/2023-01/labels, the resulting shipment is not recognised in the front end at all!

It appears under Manage Shipments -> All

but it does NOT appear under Manage Shipments -> Pending, Manage Shipments -> Rejected, Managed Shipment -> To Print

More importantly, if I select the checkbox for the shipment, and click Bulk Actions -> Schedule Pickup. The system says "Please select at least one shipment"

Why does it not recognise api created shipments?