It should create a new UUID when it is reinstalled and will need a new key, if you have any snapshots from before this happened you may be able to roll back without getting a new license. Try re-initialize first and if that doesn't work you may have to delete and create a new VM. 
Hello everyone I have UnityVSA-5.1.0.0.5.394 running on my lab I have created 7 vmdks: one 32GB on an NVME2 disk and put it on "Extreme Performance Tier" three 100GB on RAID_1 SSD disks and put it on "Performance Tier" three 256GB on an external USB_HDD disk and put it on "Capacity Tier" with all disks I created a 1TB Pool then added 2 LUNs, the first 100GB Thick and the second is 900GB Thin. up to here everything runs smoothly and as desired. When I put the two LUNs into heavy writing load, the SPA reboots and I end up with both LUNs fails along with their Pool and the Pool goes offline !!!!!!!!!!!! Can someone give me a clue what is the problem ?????   [IMAGE]    
UnityVSA pool shows offline