I am trying to connect my LaCie thunderbolt 2 5big drives to my new Mac Pro.  They will not mount.  If I unplug them and plug them into my MBP they mount immediately

I have 2 LaCie Thunderbolt 2 5Big drives.  I have been using them successfully with my mbp.  I just purchased a Mac Pro and plugged them in and they will not mount.  I am stumped as how to get the Mac Pro to recognize them

This is the Mac Pro black cylinder, late 2013 model?
Have you tried one at a time? Have you tried different ThunderBolt ports?
What display are you using and what port is it plugged into? You may want to be sure your drives and your displays are not on the same bus.
This article show which ports are on which ThunderBolt Busses:
Mac Pro (Late 2013): Using multiple displays - Apple Support

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