No sound in Sony Vegas pro using UR-RT2

I get no sound in my video editor Sony Vegas Pro with the UR-RT2 interface. The correct device is selected i my Audio Device preferences. But still no sound. It was working with my former device (Scarlett 2II). Not the Steinberg. Any ideas? Thx!

Did you install the tools and asio driver for the interface? Does the sound work outside of Vegas, in other programs or as a windows playback device?

Yes it works outside Vegas. I don’t remember if I installed the drivers. Probably because it appears in Preferences in my DAW and works with my Windows 10 pc.