I'm working with an environment that previously installed Office 2016 on client desktops without O365 synchronization. That is, Office 2016 was installed and activated with a product key and not synced to an O365 tenant or installed from OWA.
Now, the group wants to deploy an O365 tenant. What is the best way to have newly created O365 accounts linked to client desktop Office installs? Should we re-install Office from OWA for all machines? Or can we somehow update client desktop activations to use the new O365 account?