Track Word Document in Office Online Server

I have created the Office Online Server farm (version 16.0.10338.20039) and integrated it with my SharePoint OnPrem (2019) with the WOPI host. All the things are working fine but I am unable to track changes in word document, as I could not see any feature available when I opened the document. I have also tried to allow Track changes for all in offline document before uploading it in SharePoint environment but getting the same result.

My client requirement is to track the changes of the users, those have performed any activity on the document by means of Track changes feature, as it is available in One Drive (the other scenario, just mentioned here for example).

I have read many articles related to this, but not sure whether by updating the office online server, solve my issue or not. If yes, then at which version I need to update?