Viewport option: Show>Advanced>Vertex Colors doesn't display the vertex colors for a Skeletal Mesh. This viewmode works fine for Static Meshes.
There is also no option to display the Vertex Colors in Persona.
1. Import a Skeletal Mesh with Vertex Color information.
2. Place in scene
3. Turn on Show>Advanced>Vertex Colors
No Vertex Colors shown
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-17015 in the post.