This is very odd to have two printers failing with new, genuine carts.
It’s possible to receive one bad, genuine cartridge but not three.
Make sure that the carts are venting properly, IOW, make sure that any wrappings that need to be removed, have been removed from the cart(s).
To test whether or not the printhead is clear try this :
Take a paper towel and fold it into quarters.
Thoroughly moisten the PT with water…distilled if you have it (tap is OK).
Take one of the carts and gently blot it onto the PT.
You should see a black mark on the PT with light pressure.