The correct option is .

Jira automation uses smart values that must be wrapped in double curly braces so is evaluated at runtime and replaced with the issue's assignee. You can also reference subfields if needed for a specific property such as .

issue.assignee without any braces will be treated as literal text and the automation engine will not substitute the assignee value.

[issue.assignee] uses square brackets and is not valid smart value syntax so it will not be resolved to the assignee.

$issue.assignee with a dollar sign is not the smart value format used by Jira automation and it will remain as plain text.

{issue.assignee} uses only a single pair of curly braces and that is not the correct smart value syntax so it will not be interpreted as the assignee.

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