This license upgrades the 2 non-stack port to 10G. Physically speaking, this is the first two. So only these ports can do 10G, out of the 4 available. Are you connecting to the correct ports?
16542 - Dual 10GbE Upgrade License - License that converts the two non-stack 1GbE SFP ports to be 10GbE SFP+" but port is not getting active. No led indication.