Why do I see JIRAUSERxxxx as worklog author

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Question	Why do I see JIRAUSERxxxx as worklog author?
Answer	Due to GDPR change, Atlassian has changed the way to identify a user. Newly created user now has JIRAUSERXXXX as their userkey which is the unique identifier of a user. Tempo uses this information to look for user information linked to a worklog. You can read more about this userkey change in the Atlassian documentation, more specifically, in this article.