Make sure you match the requirements:
Requirements :
- Visual Studio Community, Professional, or Enterprise for Mac version
7.5 or later.
- Visual Studio Team Services, or Team Foundation Server 2013 and later.
- A Project in Visual Studio Team Services or Team Foundation Server, configured to use Team Foundation Version Control.
TFS Authentication:
To connect to TFS, enter the server details and your account
credentials. Enter a domain to use NTLM authentication, otherwise
leave blank to use basic authentication. Select Add Server:
And for your specific issue -- I do not see any / all of my projects :
After authenticating you should see the list of projects. By default,
only TFS projects to are shown. To see other types of projects, check
the "See all projects" box.
Keep in mind that projects that are on the server will not appear if
you don't have the correct privileges.
Please see Connecting to Team Foundation version control for details.
UPDATE:
Just try to uninstall the vs for mac, and install it again with the latest version, installed the latest extension. That should be work.