I have been using MSFT Office on my Mac for many years. About six months ago every time I tried to open an Office product it asked me to Activate the file first. I worked with a MSFT rep about a month ago, and he had me delete Office and reinstall. This did not help. Someone suggested that the problem is that Office is not communicating properly with the Mac keychain. (I do not have this problem when using a Windows 10 platform.)

Does anyone know what the keychain should contain, and how to fix same if that is the problem?