The D710 has digipeating built into the radio when the internal TNC is not in kiss mode.
It's in the manual, that I don't have handy to tell you the setting to set for it to digipeater stand alone.
Several YouTube videos on how to do it too.?
But, if you want APRSIS-32 to do the digipeating, you have to have a KISS port set up in APRSIS-32... that port can be something like a Digirig with a soundcard modem of your choice or? by using the 710 internal TNC in KISS mode.? Once a good KISS mode port is there, then you have to have the digipeat?settings in the aprsis32.xml -AND- APRSIS-32 in DEV mode ( an .xml setting separate from the digipeat?settings ).