How to disable Atlassian Account via API with SAilpoint

Question

I have discovered that our JIRA Accounts are not disabled through Sailpoint. All other steps are functioning well but not disabling, which causes a problematic leaver process.

I try to disable test users in Postman with PUT and /jira/rest/api/2/user/?username=testuser, it is functioning. But I can't automate it without a fix username.

URL:

/jira/rest/api/2/user/user?username=$plan.nativeIdentity$

Body:

{
    "active": false
}