Hi @bhadresh_hampanna_external ,
Anonymize is usually done when somebody is leaving your organization and requests to have their personal data erased.
At present, there is NO native functionality to bulk anonymize users.
There are rest api related and you can find details here:
https://docs.atlassian.com/software/jira/docs/api/REST/8.13.0/#api/2/user/anonymization-validateUserAnonymization
But, before making any changes, I would request you to read what happens when you anonymize users:
https://confluence.atlassian.com/adminjiraserver/anonymizing-users-992677655.html
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