Digital Signatures on PDFs won't show up on apple, ipad, or iphone

There's another post with the same title, but not the same problem.
We provide our clients with 1000's of State PDFs, and some of them we need to sign. So we give them to our clients with our digital signature on them.
We make the signature with acrobat pro...  All PC users can see it just fine, but EVERY apple user can't see the signature.
We've even borrowed an apple laptop to see if we could see it there.  Somehow Apple blocks the view of the signature....
You can't see it, or print it.  I have had this happen on PCs when we've done "Stamping" or used the handwriting tool, because it puts the handwriting over the pdf, and then the end user would have to go into their print options and click the "Print with markups" option, but this is different.  No PC users ever have to adjust their printing preferrences.
Anyone know if there's an adobe or acrobat download i could send Mac users along with the pdfs to make these visable?
Thanks for your help...

The PDF viewer named Preview that comes with the Mac does not support digital signatures. Adobe Reader/Acrobat do, so you could try to convince them to install Reader, but it's not available for the iPhone or iPad.

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