Problem removing a group from a Role's default membership

[Dave F]

I'm having trouble removing a user group from being the default membership for the User role.

The group is populated by AD logins, and is our equivalent of the jira-users group (and named very similarly)

I can add and remove other groups, including other AD populated groups (nested AD groups). 

I can add the problem group and it appears as a duplicate, and I can then remove one of them, but not both.

I really want to remove this from being the default for the Users role because I want to start locking down project visibility from external vendors who will soon start using our Jira during projects

[Dave F · Accepted solution]

The problem turns out to be a defect in the way Jira server handles user groups added to the default membership set with a different case to the actual group name (e.g. jira-users !+ Jira-Users)

If anyone wants to add their weight to fixing the issue, the Atlassian defect is https://jira.atlassian.com/browse/JRASERVER-63854

[Rahul Krishna]

May be try to create a different application access for external vendors