It is not possible to add new users to a group using the administration panel.
When I select a group I see this link:
Which only allows me to see this (list + remove users)
It seems this new administration panel is quite buggy.
Solved! Go to Solution.
It seems that there is now a new "Assign users" button" (that disappears after clicking the misleading "View & edit all users") that does what I was looking for. This can be closed.
Looking at your LastPass account, it seems you have reached the maximum number of users currently allowed under the license agreement. Let me know if you want help increasing this limit.
I am not speaking of creating a new user, but adding an existing one to a group...
This works fine in the old administration panel but can not be done in the new one.
Sorry I'm not quite sure where you're experiencing the trouble there. Are you able to create a recording / screencast of how you are adding the user to the group?
It seems that there is now a new "Assign users" button" (that disappears after clicking the misleading "View & edit all users") that does what I was looking for. This can be closed.