Adding an image to a listing via REST API

I’m trying to add an image via REST API (from a python script).
My plan was first to

  1. find the listing ID using the Title,
  2. set the image as the property of the listing.

In order to find the listing ID I was trying to access:
/wp-json/hivepress/v1/listings with
HTTPBasicAuth(wp_username, wp_password)
but I’m getting 406 response.
Any clue?

any other way to achieve the above?