TPS25821: USB C-Communication not possible

Part Number: TPS25821

Tool/software:

Hello, 

we are using TPS25821 as source device to charge the external devices but we want to have also possibility to update the firmware of our electronics (over computer USB-C connection).

When we use USB-A to USB-C cabel we have the communication and firmware update is possible but not with USB-C to USB-C cabel.

Our electronic will be supplied in both cases externally.

What could be the problem that we do not have communication with computer USB-C ports?