This must be a bug, because it's worked fine in the past, but now the groups don't show-up and it won't let me add groups to the project...
But, there's are a few groups that I've added in the past, I just can't add an additional group, there's no other groups that show-up.
Under the People section of the Project Settings it even says "Search for names, groups or email addresses." But now, it appears to try to create an email address from the group I'm trying to add, but it's a group name, so there's no email for it.
This used to work just fine in the recent past, so not sure what changed. I'm a full Jira and Org admin, so I "should" be able to see every group, etc.