Please make sure that you make the request using the method described in the documentation; if you, for example, make a GET request instead of a POST request, you will see the not found error. Also, if you get a 401 error, then you are most likely not logged in, I recommend reviewing this doc: Authentication – REST API Handbook | Developer.WordPress.org
I was using WP Rest Api Authentication. It works fine for other APIs, but doesn’t work for HivePress APIs. After looking at its usage in ExpertHive, I found that hivePress APIs require Nonce too. Will try to figure out if that can be circumvented or create new APIs with HivePress models . Thanks