It is recommended that you de-activate a user instead of deleting the user to preserve history and activity.
Read more here
However, if you really would like to delete the user, re-assign all his issues, filters and owned dashboards to a different user. You will then be able to delete the user. (You can use bulk edit)
Hi all! Lauren here from the Enterprise Cloud marketing team. I have some exciting Cloud updates from #AtlassianSummit that I wanted to share. We want everyone in your organization to be ab...
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