Beginning with 2nd June, only the "Single Sign On" option for login to the GitLab web interface will be possible. If you don't have an MPCDF wide second factor so far, please get one at our SelfService (https://selfservice.mpcdf.mpg.de). The GitLab internal second factor will not work.
The latest version of datascience-notebook seem to be incompatible with the jupyterhub version, we are using right now. This fixes the version via image tag in the tools.json.