It seems like you are trying to stream audio directly between two DAW’s via SoundGrid driver, while streaming the SG Driver’s outputs in one DAW to SG Driver’s inputs in another DAW.
This won’t work, since the SoundGrid Driver is actually an Asio to SG / SG to Asio converter. As such it requires a SoundGrid host application (such as SoundGrid Studio for example) to come in between.
Also note that SG host applications require a SoundGrid Server in order to work.
Please make sure that SoundGrid Driver is selected as the audio engine in the DAW.
In case it is and that is not the root of the issue, don’t hesitate to contact Tech Support for further assistance.