This is a weird one. Facebook rejected boosting of a post on my page - but the audience was specifically set to page subscribers only.
So I can make a post with "unsuitable" content to the page (post was wishing everyone a happy new year, links to a site that has the text "18+" and "sex chat", but with no images), yet I can't boost that same post so more subscribers to my actually page see it.
The other odd thing is that I have boosted posts with the very same link previously.
Seems to be no avenue of appeal, just keep trying until something works.
