@chuckonelli take your original M584
M584 X5 Y6 Z7:8:9 C2 E4:3:0:1
That uses physical driver order so on a duet 2, they are as follows
0 = X
1 = Y
2 = Z
3 = E0
4 = E1 and so on
M563 uses the Extruder order as defined in M584
So in your original M584 you're using E0, Z, Y and X in that order. So rather than the driver mapping used in M584 in M563 you now use
E0 = 0 = D0
Z = 1 = D1
Y = 2 = D2
X = 3 = D3
If you'd ordered them differently in M584 then that ordering changes.
If you'd used M584 E6:7:2:1 the D0 would be driver 6, D2 would be driver 2 and so on