A record has been assigned to a user but they want to change the ownership to another user or queue. When they try to change ownership, they get an insufficient privileges error message.
Also note that you will not be able to make an inactive user as the owner of any record.
Record ownership changes in Salesforce can fail due to missing Transfer Record permissions, restricted object access, active validation rules, or Apex triggers.
Follow these steps to diagnose and resolve the issue.
Check for any validation rule that looks like:
See also:
Error 'Insufficient Privileges' when transferring a Case record
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