Yamaha AP-u70, no 24-96kHz

Hi @support,
my Yamaha AP-U70 is configured with Roon.
I got no problems playing back 44.1kHz and 48kHz but 24-96kHz doesn’t playback.
I dosen’t show up in the supported list.
The same Yamaha could playback 24-96kHZ fine under Linux-Mac-Windows.

The Yamaha AP-U70 is USB connected to a NUC running ROCK.