Create Theme REST API returns 200 response instead of 201 and does not create theme

[haiderdev]

Create Theme REST API: https://shopify.dev/docs/api/admin-rest/2023-10/resources/theme#post-themes

does not creates theme on user's store AND also
returns 200 response instead of 201 (as specified in the documentation)

returns errors as false 

Am doing the same thing as described in documentation