Add new group member issue

[whp19850316]

Hi
I try to add a new group member as below
resource "jira_group_membership" "gm_1" {
username = "5ce70548f433c20ff113316e"
group = "Terraform_Managed"
}

Have error "Error: Request failed: Creating Request failed: {"errorMessages":["Specified user does not exist or you do not have required permissions"],"errors":{}}: request failed. Please analyze the request body for more details. Status code: 404", I use accoundId, but I do not think Jira can support user name to add group member.

Could you give me a hint how to add a group member? Thank you