There seems to be a bug with the bridge officers that were unlocked account wide in the Zen Store.
Basically, the Officers can't be claimed because even though they're unlocked.. it tells you that you don't have enough Zen. Source Thread.
However, there this bug can create a big problem if you actually have a Zen Balance as claiming your 'free' account wide Bridge Officers takes your Zen! Source Thread.Another thread here.
Support can restore your Zen if this happened to you, but until this is fixed, do not claim these officers if you have Zen banked.
Discovery is good, it's you that sucks.