I'm going insane with this problem and I can't find the answer. I have installed our Volume License of 2016 for Mac on several computers and used the Serializer and it works just fine. I have one computer that is not working here is what is going on:
1. Computer is domain joined (that is different than the other Macs)
2. User is not a local admin
3. Problem exists, though, with a local admin account (on-machine account).
I can run the serializer, it says successful. Immediately after loading Office, it works fine. I don't get the complaint that I have to activate the product. I can open and save documents. But after a period of time, opening Word/Excel, etc it starts prompting that we need to activate.
I researched and it seems the .plist file that is put in /Library/Preferences somehow goes away. One time I saw the ....serializer.plist file but not a ....serializerV2.plist file which is what the serializer creates.
I can't seem to figure out how to KEEP it serialized. Office is up to date completely with the latest versions of the apps.