We've created teams via the People function and they work well, for most users. Some users cannot @ any of the teams, however. I do not see any difference between the permissions for users who can mention and those who can't. Both are "Basic" access, are part of the "jira-software-users" group. Browse Users and Groups has "jira-software-users" included. The only difference is the email domain they are using is different.
How do I enable any user to have this ability?