Hello, friend!
According to the problem description: The same CM type(CGA4233 ), when connected to a D-CMTS MA5633 H822CCKRC chassis/hardware ,the eMTA's services workjust fine with PacketCable2.0 - using the same CM configuration file.
The MA5633 subrack does not exist affects the creation of service flows. In addition, you fail to create a service flow on the third-party device. I think the problem is not caused by the MA5633.
You are advised to replace the CGA4233 and check whether the device works properly.
Thanks!