The Python API Client often uses relationships (e.g. status) to update entities, but when using the raw API backend or the JS API client I recommend that you instead the relationship key attributes instead. In this case, that would be `status_id`.
A more complete example of a request body would be:
[
{
"action": "update",
"entity_type": "Task",
"entity_key": [
"12bd29be-72b0-11e7-96a7-0a580ae40a16"
],
"entity_data": {
"status_id": "44dd9fb2-4164-11df-9218-0019bb4983d8",
"__entity_type__": "Task"
}
}
]
Regards,
Lucas