Hi @TA DIGITAL ,
Till now I did not get this type of issue in a cloud instance. This is might be recent changes made to GDPR. Hope you have gone through the Changes to usernames in Jira Cloud page on GDPR changes.
Here is the same article posted by some other community members: https://community.atlassian.com/t5/Jira-questions/Usernames-are-being-replaced-with-account-ID-when-mentioning/qaq-p/1097083
Regards,Kishore Kumar Gnagavath.
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