LDMS 2016 requires Windows Authentication for the configuration center to setup your Workspaces (My.BridgeIT). This needs to be modified in IIS Manager.
Under "Sites\Default Web Site\ConfigurationCenter" in IIS you will see Icon for Authentication and there are 2 options to disable.
Disable Anonymous Authentication and Forms Authentication. Make sure that Windows Authentication is enabled.
You will now use your Core credentials to log into configuration center