icx7650 Stack Ports Down

[CiscotoRuckus]

Do icx7650's require license for stacking?  I can't seem to find the answer.  Using 40G QSFP Passive Copper cables.

device#sh interfaces stack-ports

Port Link State Dupl Speed Trunk Tag Pvid Pri MAC Name
1/3/1 Down None None None None No N/A 0 c0c5.207f.xxxx
1/3/2 Down None None None None No N/A 0 c0c5.207f.xxxx

device#sh license
Unit License Name L3 Premium Port Speed Upgrade Speed Ports
1 l3-prem Yes NA NA NA

Thanks