HP Z2 G4 motherboard question about slots

Which m2 slot to use - motherboard with m 2 slot With 10th Gen Intel Core Processor installed, the first slot is working on MSI B560M MORTAR WIFI, BAZOOKA, PRO-VDH… motherboard with m2 slot slots on the Z590 AORUS PRO AX? This was one of the key selling points of this motherboard back when RKL was fresh, and I bought into it

mode demo slot ASUS ROG STRIX B550-A GAMING ATX Motherboard For AMD Ryzen 3rd Gen 5000 Series CPU, Socket AM4 - AMD B550 Chipset - PCIe - 2x