Thunderbolt compatible cables are their own pain in the butt. Apple loves their power only, and I had to order from Monoprice Thunderbolt 3 40Gbps 100W cable, and not get suckered with a 60W or a 20Gbps cable. To save others the trouble, here is the link https://www.monoprice.com/product?p_id=24722 because that seems like the easiest if you have to have a single cable type around.

To think, memory used to be the number soup......