Start a Count Edges task with a hardware trigger PCI-6122 or PCIe-6353

Hello,

I need a Count Edges started with a hardware trigger, but I get an error -200452 that Start.TrigType is "not supported by the device or is not applicable to the task".

Tried this on a PCI-6122 and PCIe-6353.

I actually need this to work with a buffered counter application, but I'm surprised that I can't even start a simple edge counting task. What am I missing?