Cannot find a definition for command named scan (Official Partner Orb)

I’m trying to use the official Snyk orb, but I am unable to pass parameters to it without receiving for the following error:
Cannot find a definition for command named scan

For example, if my job’s steps look like this:

- checkout
- snyk/scan

Then I have no problems. However, as soon as I pass parameters, as follows, I hit the error:

- checkout
- snyk/scan:
     fail-on-issues: false
     monitor-on-build: true
     organization: 'test'
     project: '${CIRCLE_PROJECT_REPONAME}/${CIRCLE_BUILD_NUM}-build'

This seems to be the case with other orbs I’ve tried in the past as well. Why is this? Is there something obvious that I’m missing?

Here’s my full config for reference:

version: 2.1
orbs:
  snyk: snyk/snyk@0.0.10

jobs:
  build:
    docker:
      - image: circleci/python:3.8.3-node
      - image: circleci/postgres:9.6.5-alpine-ram

    steps:
      - checkout
      - run:
          name: Generate cache key
          command: shasum requirements.txt requirements_dev.txt > requirements.sha
      - restore_cache:
          name: Restoring yarn and node_modules cache
          keys:
              - yarn-deps-{{ .Branch }}-{{ checksum "yarn.lock" }}
              - yarn-deps-{{ .Branch }}
      - restore_cache:
          name: Restoring Python dependencies cache
          keys:
            - requirements-{{ .Branch }}-{{ checksum "requirements.sha" }}
            - requirements-{{ .Branch }}
      - run:
          name: Update Node.js
          command: |
            curl -sSL "https://nodejs.org/dist/v12.8.1/node-v12.8.1-linux-x64.tar.xz" | sudo tar --strip-components=2 -xJ -C /usr/local/bin/ node-v12.8.1-linux-x64/bin/node
      - run:
          name: Check current version of node
          command: expr `node -v | tr -d '\n'` = v12.8.1
      - run:
          name: Installing psql
          command: sudo apt install postgresql-client
      - run:
          name: Waiting for PostgreSQL to start
          command: |
            for i in `seq 1 10`;
            do
              nc -z localhost 5432 && echo Success && exit 0
              echo -n .
              sleep 2
            done
            echo Failed waiting for Postgres && exit 1
      - run:
          name: Install Python deps in a venv
          command: |
            python3 -m venv env
            . env/bin/activate
            make install
      - save_cache:
          name: Save yarn and node_modules cache
          key: yarn-deps-{{ .Branch }}-{{ checksum "yarn.lock" }}
          paths:
            - node_modules
            - ~/.cache/yarn
      - save_cache:
          name: Save yarn and node_modules cache (by branch)
          key: yarn-deps-{{ .Branch }}
          paths:
            - node_modules
            - ~/.cache/yarn
      - save_cache:
          name: Save python dependencies cache
          key: requirements-{{ .Branch }}-{{ checksum "requirements.sha" }}
          paths:
            - "env"
      - save_cache:
          name: Save python dependencies cache (by branch)
          key: requirements-{{ .Branch }}
          paths:
            - "env"
      - snyk/scan:
          fail-on-issues: false
          monitor-on-build: true
          organization: 'test'
          project: '${CIRCLE_PROJECT_REPONAME}/${CIRCLE_BUILD_NUM}-build'
      - store_test_results:
          path: test-results
      - store_artifacts:
          path: test-results
          destination: tr1
workflows:
  build:
    jobs:
      - build