Not sure if you can do it at the same time…I think SYnc A & B are for DINN sync, which is a different thing.
I would daisy chain, with the Volca at the end of the chain, as it has no out.
So, AK MIDI Out to OP1 MIDI In, OP1 MIDI Out to Volca MIDI In
I guess you’ll need some kind of USB-Midi cable for the OP1? You could try USB straight from AK to OP1… worth a try, the USB does send clock. Just make sure the OP1 is set to recieve clock. The Volca will be automatically.
Let us know how you get on 