When you slide the bottom of Pole A into the top of the black wrap, the pole does not emerge at the bottom of the black wrap. It’s not long enough, and the eye-bolts at the top of Pole A prevent you from sliding it all the way through.
Pole A and Pole B are designed to connect INSIDE the black wrap. [Note the position of the push-pin hole at the bottom of Pole A] Slide the bottom of Pole A into the top of the black wrap, and push until the eye-bolts are in line with the top of the net. [Note the position of the push-pin at the top of Pole B] Slide the top of Pole B into the bottom of the black wrap until you feel it make contact with Pole A. Feel (through the black wrap) for the push-button, press and push Pole B until it slides further into Pole A. Rotate Pole B until the push-pin clicks into place. For disassembly, feel for push-pin, press and pull to release Pole B.
If it’s difficult to connect the poles inside the black wrap, remove the eye-bolts at the top of Pole A (temporarily). Connect Pole A and Pole B (use the push-pin at the top of Pole B to connect with the push-pin hole at the bottom of Pole A) Slide the top of Pole A into the bottom of the black wrap. Push until the top of Pole A emerges from the top of the black wrap. Re-attach the eye-bolts and continue with assembly.