Using a Blender textured 3d model in PowerPoint I have created a 3D model and added texture to it in Blended. 

How do I save the file in a way that it keeps the texture so I can use it in PowerPoint 365. 

Seem to always lose the colour and end up with just the model shape. 

Thanks,
Export GLB file with it's textures and import it to PowerPoint.

how to set up the glb textures properly is shown here:
https://docs.blender.org/manual/en/latest/addons/io_scene_gltf2.html

Edit:
This is the setup for the textures


and then import from file