STUSB4761 rejects PDO with 5A

[mrs]

We try to use STUSB4761 for a 100W USB-PD Source.

Test setup includes our PCB with STUSB4761 as power source, an e-marked 5A rated cable and Acroname "USBHub3c Pro Edition" as power sink.

According to the log (see Attachement) of the USB PD communication, STUSB4761 advertises in the 5th PDO 20V/5A but if I try to select this PDO the request is rejected.

Is there anything wrong with this configuration?

    

[NBALL]

either our stusb4500 with different cables, either equipment used for certification, listed under USB-IF

Best regards

[mrs]

Hi

Is ist possible that STUSB4761 get confused by extended enquiries, i.e. by those “Get …” commands? 
See the attached logs.

Because if I disable the "Auto Discovery" sequence in the test device the chip works as described in the datasheet.

Best regards, Michael