I have used a clipping mask in Illustrator on a vector object. When I export as EMF and import in to PowerPoint the mask got released.
Is there any way to export from Illustrator and retain the clipping mask to use in PowerPoint?
Clipping masks don't work outside of Illustrator. Use your illustration as a transparent PNG instead.
Expand and flatten the clipping mask in Illustrator. Then save.
For Powerpoint, the WMF or EMF files needs to be as simple as possible. Or save as a PNG in Illustrator and use that in Powerpoint since Microsoft apps really prefer RGB raster files.
Use Pathfinder Divide prior to export.