license keys already in use

[kevin_crafton@mytexpolymer 0]

Support,

We have a 12 user license and on the license portal it shows all 12 in use but we have only 7 working copies currently.   I know one of the 5 held licenses is from a computer crash last week and we recently went through a Windows 10 upgrade so others probably weren't deactivated prior to the upgrade.   My question is how do we get those 5 licenses back?