The mention feature rely on Confluence's index. If we have a malformed index, we can have problems trying to find users when we use such feature. This problem usually happens after an upgrade or a Confluence that is running for a long time. To fix the problem, we need to do a rebuild of content indexes from scratch.
I hope this helps.
Do you use templates with Confluence? Take part in a remote 1-hr workshop. You'll receive USD $100 for your time! We're looking for people to participate in a remote 1-hr workshop...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs