Since 2016, new accounts are using "New, In Progress, Completed, On Hold and Cancelled" Task statuses.
Still through the API it is only possible to make use of the older "Active, Completed, Deferred and Cancelled" statuses.
I guess you could change the workflow status via a PUT request to the /workflows/ URL and query "customStatus", but for that you would need a Business account, else you get 403 errors.
So that means that there is at the moment no possibility to use the "In Progress" status via API, since using the "Active" status, puts everything back in "New".
These are default task statuses, so it is strange that they are being considered as "custom".
So unless I'm completely missing out on something here, could you please fix this anomaly since the default tasks are not fully usable at the moment via API?
A temporary solution where "In Progress" could be mimicked (maybe by tricking the system by setting 2 or more other parameters as well?) would be most welcome.