We call it the 'Thick Client' more politically correct
OnDemand thick client does not use inline fonts when viewing AFP documents, usually, you get a popup about mappings not found. You need to set up the font mapping in customized csdef.fnt/cpdef.fnt and alias.fnt files for your shop.
C:\Program Files (x86)\ibm\OnDemand Clients\V9.5\Font
It is not an easy task and if you have never done it, you might require IBM services. If it is not going to be the main way users view the document, I recommend you use a different AFP viewer to view the document. (Save the document out of the thick client as a AFP file, then open with a different viewer)