More information is needed to answer your question.
What version of Office 2016 do you have? Version, 15.37? 15. 38? 15.39? 16.6?
What version of The Mac OS do you have? Mac OS 11? MacOS 11? Mac OS 12? Mac OS 13?
If you are a Microsoft Insider user and Using (some people myself included) have volunteered to try Version 16 of Office, some features are actually turned off. The reason is the feature is not yet perfected enough to be added. If you are using 16.6 you
need to move your question to the Mac Insider Forum.
If you are still using 15 series come back to this thread and version numbers of Office and MacOS.
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Disclaimer:
The questions, discussions, opinions, replies & answers I create, are solely mine and mine alone and do not reflect upon my position as a Community Moderator.