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TPS23880: TPS23880 Hand Shaking failed

Part Number: TPS23880

Hi Support team

My customer adopted TPS23880 for one port POE power injector, the application circuit is as following, the max power is 45W,they used  MSP430FR5969IRGZ for housekeeping MUC and TPS2373-4 EVM-758 for PD to test the function,  

the PD would not power up since hand shaking failed, may I have  your kindly advice and guide us how to resolve the issue

 CH2 is PD output voltage, CH4 is output current,