Thanks SuccessfulKoala55
Also, https://clear.ml/docs/latest/docs/references/api/tasks#post-tasksget_all gives me userID

<tasks.Task: {
"id": "xxx",
"name": "Interactive Session",
"user": "6cfef1d32",
"company": "xxxx",
"type": "application",
"status": "in_progress",
.....

}
I can't find api endpoint to get user name from user_id like "user": "6cfef1d32" above.