There was a known bug regarding these kind of mentions would fail that you can find at JRA-45836.
Here is a description of the issue from the bug ticket:
e.g: email@example.com may be filtered out when searching for m if there are many more users with @mydomain.com email address and at least 10 users alphabetically before mike.
If you're using a JIRA server 7 version before 7.1.8, then it is likely that this bug is affecting you. An upgrade to JIRA Core 7.1.8 or higher will fix this issue. There are two workarounds listed:
Try with a different user value (if you tried with username, try display name, or last name). The last name value works particularly well as it is quite unique.
Typing the first few characters of a user's name and hitting the TAB button will autocomplete and allow for the user to be mentioned (until you refresh the page) e.g. John = Joh...TAB
If you are on a version of JIRA above 7.1.8 or a Cloud version let me know which version and we'll go from there.
Badges are a great way to show off community activity, whether you’re a newbie or a Champion.Learn more
...+ reading Fantasy). The same is true for him at the bank he works for: Efficiency is key when time literally equals money. Read on to learn how Sergey makes most of the time he has by...
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