I am sending them back to Amazon.
You may also try contacting Sabrent support.
And if you aren’t in a hurry than wait a while for other responses here - someone may have other suggestions.
I tested the two NVMe on my desktop PC… and even there they are not recognized
Is your desktop also Ryzen based? If yes then please check for the SSD firmware updates.
Also: Asrock unfortunately does not list QVL storage lists for their Rack line but they do for consumer boards. For example https://asrock.com/MB/AMD/X470%20Taichi%20Ultimate/index.asp#Storage