I was having the same issue and about ready to give up.
Removed all of:
[RemoteSession]
+Channels=(Name=FRemoteSessionFrameBufferChannel,Mode=Write)
+Channels=(Name=FRemoteSessionInputChannel,Mode=Read)
+Channels=(Name=FRemoteSessionARCameraChannel,Mode=Read)
+Channels=(Name=FRemoteSessionXRTrackingChannel,Mode=Read)
And it worked fine after that