I got "You are not allowed to use Docker. You must be in the docker-users group." error when I started docker desktop for the first time after installing it. It's easy to fix this error. I just needed to -

  1. Open Computer Management as an administrator.
  2. Open docker-users group under Local Users and Groups > Groups.
  3. Add current user in the docker-users group.
  4. Restart the computer.