I bought a cheap key from ebay which worked 100%, but after reinstalling win10, office did not want to activate using the same key on the same pc, although win10 had no problem reactivating. I installed this office key after logging into ms live. Isn't office 2016 tied to your live ms account like win10?
No,MS Office does not have a digital license concept like win 10(tied to a ms account & transferable).That cheap key was stolen/leaked & so after its max activation attempts were crossed,MS blocked any further new activations using that key. P.S. I find it amusing that people are not willing to give money to MS or not believing a $10 luxary watch with price tag of $100 deals & yet willing to buy cheap MS keys over ebay instead of simply using kms activators so as to think of themselves on a morally higher ground than pirates.