Hi @Doran Lum ,
How did you activate the Office 2016? Did you have a Microsoft account or product key?
First I suggest you refer to this support articles about activate Office:
https://support.microsoft.com/en-us/office/activate-office-5bd38f38-db92-448b-a982-ad170b1e187e
Just checking in to see if the information was helpful. Please let us know if you would like further assistance.
Try to provide more information and I'm glad to help you.
If the response is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.