When I use X-CTU and select Function Set XBEE 802.15.4, Version 10E8, I see that the relevant things to configure are PAN ID, MY, and DL. You have set PAN ID the same on each XBee, and set DL (though I don't see how you set it to that value). But, you said nothing about setting MY on the two XBees. MY on one must be DL on the other.