SVGs imported into PowerPoint are missing icons included via URLs

[MLNW]

When I drop the SVG of a diagram including icons into PowerPoint the icons themselves are missing. Here is an example diagram:

classes: {
  container_image: {
    shape: image
    icon: https://icon.icepanel.io/Technology/svg/Podman.svg
  }
  users: {
    shape: image
    icon: https://icons.terrastruct.com/essentials%2F359-users.svg
  }
}

image: Container Image {
  class: container_image
}

users: Users {
  class: users
}

image <- users

Expected	Actual
VS code, Firefox ...	PowerPoint

d2 --version
v0.6.3