Hover over user name produces 'profile: No user undefined Error' after upgrading from 3.x
Platform Notice: Data Center Only - This article only applies to Atlassian products on the Data Center platform.
Note that this KB was created for the Data Center version of the product. Data Center KBs for non-Data-Center-specific features may also work for Server versions of the product, however they have not been tested. Support for Server* products ended on February 15th 2024. If you are running a Server product, you can visit the Atlassian Server end of support announcement to review your migration options.
*Except Fisheye and Crucible
Problem
When hovering over a user's name, we receive the following visual error:

Cause
The hover profile user macro was previously used.
Resolution
This macro has been replaced by a built-in function that provides very similar functionality (@mentions). Replace each instance of the hover-profile user macro with a link to the user in question (e.g., @username)
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