You've got the right permissions, you've got the right space in the macro, the labels have been there long enough to be indexed, so all other things being equal the most likely scenario is that you need to re-index Confluence. I say this because whilst the permissions and macro options are will always work, sometime the page index needs a manual "kick" for [whatever reason].
Your alternative is probably to put a support ticket into Atlassian, but they'll suggest you try a re-index before anything else. Can you let us know if that works? It'll help other people who are troubleshooting the same problem in the future.
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