(like workplace or university programs) rather than direct retail, which can make finding or purchasing a new key more complex than for Home or Student versions. Where to Find Your Existing Product Key
Did you buy your key as an or through an organization/workplace ? product key microsoft office professional plus 2016 top
Over time, how these keys are managed has changed significantly: 2016 Office pro plus Product Key - Microsoft Q&A (like workplace or university programs) rather than direct