We were having trouble of getting our an addon working in one of our trialing customers cloud instance. They probably installed it with some strange permissions which unfortunately I cannot restore anymore. Thus we tried to provide all necessary permissions and do uninstall/intstall again, but still the only difference is in Global Permissions under Jira Administrators section. Addon just cries in logs that the permissions are missing in various ways.
There should be atlassian-addons-admin group in JIRA Administrators section in Global Permissions, but its not possible to add one there and I have no idea how this group is created, by whom and when. Thus since this is the only difference in configuration, perhaps someone can explain us how this group ends up there in global permissions and if possible at all how to create/manage it later.