Not showing 'Connected Lines' color pink in pdf email attachment

When using Pink as a color for 'connected lines (Polygon line)' the pink 'connected lines' will not show up when I open the pdf from the e-mail attachment on the i-phone.  If I copy the attachment and open in Acrobat on the i-phone the pink 'connected lines' will show up.

FYI: The pink 'connected lines' will show up if open on a PC. Additional info.  When I double click on the Pink while on the PC: the following shows up - Hue 200, Red 255, sat 240 green 0, lum 120, blue 255.

Thank you,

Please advise.