I have a user that I cannot direct mention via '@' in Confluence Cloud. Same user can be '@' mentioned in JIRA Cloud. She is a member of both "default user" groups for JIRA and Confluence (the same configuration for hundreds of other users that can be '@' mentioned).
Have checked numerous other articles, most of which are older and suggest reindexing (a feature no longer available to admins in cloud). Example: https://confluence.atlassian.com/confkb/unable-to-mention-certain-users-in-confluence-779165995.html
For Atlassian: Affected user is a__.st______@h___.com
@Zack_Foster I had a similar situation recently where I couldn't @mention *any* users on Confluence, only groups (didn't try Jira). Short answer is that I contacted Support and they determined the problem was with my user, so they implemented a workaround where they deleted my user then recreated it. After they did that, the problem was fixed.
From Atlassian support just a few days ago - hope this helps.
After checking the behavior mentioned by you in your last comment, I was able to notice that it is related to an internal bug which we are currently investigating with our dev team as it is affecting other users as well, and we've got confirmation from other users that once we've deleted the user and re-create it the problem goes away.
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