New Drobo 5DT Won't Except Drives "Please Help"


I just bought a new and sealed Drobo 5DT off eBay and I put 3 new 8TB BarraCuda Pro drives in all the lights turn red. Will this drive not accept these harddrives? The Drobo says "The current disk pack is not compatible with the firmware of the Drobo. Please ensure the Drobo is running the latest firmware. Which it does, this is the version on it 4.1.3 [7.196.105954]. Please advise!!!