Quite a strange situation. We use Crowd as user/group database, and once I would like to share a post of Confluence, the search doesnt give an option to choose "confluence-users" and "confluence-administrators" groups. They do exist in Crowd, as well as are synchronized with Confluence. Also, I noticed that results pop up the group which was created in Crowd, but deleted a time ago.
I tested and got the same results, then I found this bug:
Autocomplete does not find predefined groups when sharing a page
Autocomplete does find groups I create in the UI, so a workaround would be to add everyone to another not "predefined" group, and share with that group.
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