mentions does not fill in a user.
Tried multiple ways, using @ or the mentions button.
Tried in firefox and chrome.
It works on this page in this part of atlassion but does not work in my works atlassian jiras.
Are you trying to mention in the description field?
If you ware trying to do it on a custom field then you may want to take a look at this page.
In general it could be due to lack of permission. Take a look at this page as well. Basically Ensure that the user has Browse User global permission.
I hope it helps.
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