Ah! Solved it!
Had to turn on raid mode on NVMe is drives settings and change PCI-EX16_1 to _2.
PCIEX16_1 - is only capable to read 1 SSD
PCIEX16_2 - is capable to read 2 SSD
Source: https://www.asus.com/us/support/FAQ/1037507/
Also had to swap drives in the adapter to slot 1&2.
Now...
Hey guys,
Today I would like to ask you how to configure the NVMe adapter from Asus.
I had earlier a B550 which had 3 NVMe slots but once I switched to X570, I had to find a solution to mount an additional 2 NVMe in one adapter (earlier had 1 additional PCIe NVMe adapter).
My current config...