I got the problem resolved myself.
I deinstalled other audio related software or drivers recently installed on my main PC by Asus Armory Crate. Which one of the four (2 drivers, 2 programs) I uninstalled actually did the trick I am not sure. In any case these were the Realtek USB audio driver, AI noise reduction, and 2 sound related programs called Sonic Suite …
I found all of them dispensible. Uninstalled them and voilà, Roon remote worked right away
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