What do I need to do to make this transparency work

I have a PDF, I know it has transparency but Acrobat pro renders the transparent portion solid. If I view it in chrome it looks right. And if I do an output preview and change the "Show" option to "Not DeviceCMYK" it previews the transparency, but this doesn't actually change the PDF and I can't figure out how to then just remove the CMYK so that it will be transparent.