Transmit request frame results in MAC ACK Failure in XBee 868.

I’m using two XBee 868 modules, API mode. After using transmit request frame with address of the other module I get MAC ACK Failure as a transmit status frame. When I use broadcast address, transmit status is ok. However, the send frame is in both cases received successfully in the second module. What can be the problem of the MAC ACK Failure?

could we see your radio settings?