How do I configure to a group have access to the process?

I have a process where I need to set up a group to have access to this task. I already have the group created in my organization and I already have members in this group, but when I execute the process the following error occurs:

Aligning organisation between portal and studio

How do I get changes made to the organization (eg: adding a group) via the admin portal to show up in the studio so that I can configure actors to use the groups?

I understand that you have to "publish" to go the other way (studio -> portal) but cant find the portal -> studio mapping.