Try to hook the front brakes to the back hole in the master and bleed them ,then re attach to front,if possible?
Bad calipers ?
Bad master cylinder ?
Could be tons of air trapped still,did any fluid at all come out the front?

Hooking the front to the working master cylinder fitting would rule out calipers..................seems awful unlikely that both calipers would be bad or they would not be able to be bled...........,my bet is on the master cyclinder not working correctly.
Swaping the connections would rule the front calipers and determine if the one port was bad on the master cyclinder.
Could be air in the master cylinder still too,might loosen the front fitting and see if fluid is being moved at the cylinder?
I know the motto is bleed ,bleed and bleed some more ,when it comes to brakes.