On invalid input 'Zoho CRM' doesn't return proper status code.

On invalid input 'Zoho CRM' doesn't return proper status code.

Hi,
I am using Zoho CRM v2 API for development. If I try to create a module (Ex- contact) and don't provide a mandatory field in the input json (For contact, it is LastName), in that case, I get 202/Accepted in response code.
As it is a kind of error, shouldn't return in Status code starts with 4? (Ex.- 400).
Or is there any other way, I can figure out if it is an error or not. I need error information to trigger some other flow.