Asus Prime Z270-A does not detect second GPU

Today I bought this motherboard together with 2 MSI GTX 1060 6GB Gamin X, I could not get that MB to detect the second card, I’m working with windows 10 64 bit, processor celeron 3900 and GPUs connected directly to the MB.

I already probe with the configuration of the bios to detect more than 4 cards exposed in other forums but I have not been able to achieve it

Appreciate your help

Maybe you got a bad card? My Z270-A worked with multiple cards out of the box.