Apparently the masterkey cannot be used for this authentication as the error message changes when I'm using an access key - It is now looking for a request body (even though none should be provided, according to the docs), and when I do try to provide a body, it seems to search for an existing user named key-{accesskey} for some reason.. (Error code 500: user key-ACCESSKEY_HERE does not exist) Any help will be appreciated 🙂