Spanish accents issue

Hello everyone, I created a PDF fillable form for Spanish users, but when I try to type in Ñ/ñ on he Acrobat reader it wont allow me I type the universal command which is ALT+ 164/ALT + 165 and nothing. Is there a way to prevent this beforehand when creating the form in inDesign? I used a font that does include the chracter and it does work while in inDesign, but not in the interactive pdf.