X5105 XPA125B CE-19 Connection

I’m new at this forum, greetings from Austria!
I own the Digirig an use it with the X5105 from XIEGU.
FT8 wroks very well with the Digirig connected on The ACC and COM port of the device. Now I wanted to test the PA XPA125B. To connect the PA I need to unplug the ACC connecton of the digirig to connect the CE-19 device between the XPA125B and the X5105. So now I have no idea where to connect the Digirig COM plug.
Has anybody the same setup an a hint for me?
Thanks a lot
73 de Daniel, OE2DHH