Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
I know this is old, but I am replying as it seems like the discussion is not over.
I do following two things.
1. Manually activating by inserting the Product Key into the program file to omit Live ID verification.
>> For PCs I use internally, either for myself or for my organization, I began inserting a Product Key into one of the Office 2016 software files. This involves inserting a product code into a file consisting Office 2016 (or 2013) and also involves modifying a line in the file to omit verification of MS account registration.
>> I do this as this is the fastest and simplest (that can even be automated) while this is also legal as long as your Product Key is valid. You paid for a product and it is yours to use.
2. Opening an (activation use) account with email such as "ProductID_****@outlook.com" and with password same as the product key.**
>> For PCs setup for externally, I create a Live account as an online activation media. Every person I setup an Office will receive two sets of activation credentials including
(1-1) Product ID: ####-####
(1-2) Product Key: #####-#####-#####-#####-#####
and
(2-1) Activation email: ProductID_####-####@outlook.com (or hotmail.com)
(2-2) Activation email password: ProductKey_#####-#####-#####-#####-#####
>> MS account becomes inactive after 120 days (or 180 days, which I am not sure of) of non-use. If the account is not used to activate the product and/or if the account is removed from Office for longer than the set amount of time, the user may have to create the MS account again to activate it online.