STM32H745 tx callback is not getting called

[TChau.2]

Hello all,

I am using the STM32H745 Discovery board and I am using the third-party stack for TCP/IP, not I am stuck whenever I transmit a packet over ethernet in IT mode, I am getting HAL_OK return for the transmit function but Tx Complete callback function is not getting called. where could be the issue please help, I am getting receive call back function successfully for incoming packets.

Thanks in advance