MakeCode Arcade is a great platform that can be used to teach your students how to create with code. By default, projects are saved to a particular device (i.e. not to a user's account). However, you can turn on cloud saving by following these steps:

  1. Go to https://arcade.makecode.com
  2. Click on the gear icon in the top right corner
  3. Click on "About…"
  4. Click on the orange "Experiments" button
  5. Click on the "Cloud Save" card so that it says "Enabled"