A result with two numbers suggests that the link to Microsoft is OK and the problem is probably with Excel software not the connection. You should see a result with 2 different numbers. If you want to test if it's the connection, click on this link. It could either be caused by a connection problem to Microsoft’s servers or a failure in Excel. If there's no luck, you are just one of the many users who complain the same issue. Go to Excel > Preferences > Privacy and make sure Connected Serves is enabled.
It should behave as normal knowing that you are using a latest Mac OS and an up to date version of Office.