@andreasdueren I published this one but it has a bunch of issues from some testing.
Each SSO user is 'independent'. They can all separately invite users.
If registration is enabled, the app becomes open for all
If registration is disabled, invited users cannot login For this reason, even in SSO mode , it is still left open
Even if registration is disabled, one user can be registered initially. This is probably a feature.
I guess we should report this upstream , if we collect the issues