Huh, no, the stepper driver always connects to 4 wires which form 2 pairs. No point to connect only 2 wires from the stepper driver.
Connect to half coils first, use 2 of the half coils ( 4 wires) and ignore the remaining 2 halves (the other 4 wires).
You have motor
A1 A2
B1 B2
C1 C2
D1 D2
Then try use A1-A2 as a ("full") coil and C1-C2 as the other ("full") coil. The B and D remain unused and open (not connected). For the moment we ignore the fact that they are just halves. Put the stepper driver on low current setting and if possible to full step because it will be easier to see things in full step, and order a move.
Connect to half coils first, use 2 of the half coils ( 4 wires) and ignore the remaining 2 halves (the other 4 wires).
You have motor
A1 A2
B1 B2
C1 C2
D1 D2
Then try use A1-A2 as a ("full") coil and C1-C2 as the other ("full") coil. The B and D remain unused and open (not connected). For the moment we ignore the fact that they are just halves. Put the stepper driver on low current setting and if possible to full step because it will be easier to see things in full step, and order a move.