Managing Absence Tasks via REST API

Hi Experts,

We are working on automating the management of pending absence requests. The goal is to reassign a task to another user within the HR team.

Example API call:
bpm/api/4.0/tasks/2907885 
JSON body: 

json{  "action": { "id": "REASSIGN" },  "identities": [    { "id": "1182666", "type": "user" }  ]}

Despite multiple attempts, we have been unable to successfully reassign the task, as all attempts return a 400 error. The only action we have been able to perform successfully is approving the task.

Has anyone successfully executed other task actions, such as reassignment? If so, could you share insights or solutions?

Regards

Marius