When I try to mention one of our users on a page by typing the @ and then their name, they do not appear in the normal pop-up. The same user does not appear in a valid list of users when trying to share a page with them as well.
I only have this problem with one single user
Probably similar to https://answers.atlassian.com/questions/41773/user-not-displaying-in-team-calendars.
If that is the case, the workaround is to visit the affected user's profile at https://confluence-instalce/display/~the-username. Wait for a minute (for indexing to kick in) and then try again.
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