I verified the attached snapshot, I could see one of the thunderbolt port is working and the unit detected in the mac system profiler, please try to generate the logs through mac terminal Open MAC terminal and then type promiseutil and then type the following commands one at a time and save the output of the commands to a file and attach that file to this case id for review: subsys -v enclosure -v ctrl -v phydrv -v array -v logdrv -v event event -l nvram Note:- In the above command " event -l nvram " it is lower case letter 'l' but not a numeric 1. About the Thunderbolt port issue, I will check with my next level and update you the status shortly. Regards, Dinesh.K