The default email notification template contains a link to the Configuration path via the following URL:
http://<hostname>/dashboard/<configuration-id>

However, starting with 4.0.0-M1, this URL is invalid. Instead, you need to reference the path via:
http://<hostname>/overview/<configuration-id>

As a result, the links in the default email notifications are invalid. I tried modifying the template, but it uses a variable $configuration.url, which is defined elsewhere.