You can't do @mentions on groups at the moment. Just think what mischief you could get up to with @confluence-usersif this were possible - that would send some serious email on a big system.
There is a JIRA for this you can watch -- CONF-23015 -- It's got a pile of votes. Large enterprises would likely not want this feature to be enabled by default.
Unfortunately it's not possible to @mentiones group at meanwhile. We have an open improvement requests (CONF-23015) for this featurs.
I would recommend you to watch the ticket for any updates. I would also recommend you to vote for the ticket to increase the popularity.
You meight also read "Atlassian New Features Policy" to know how Atlassian chose what to implement.
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