Im trying to get my Pulse Flex to to work as a renderer. Seeing your signal path it strikes me that the Amplifier part (crossover and EQ inside of your Pulse 2) is showing as a purple light whereas mine has always shown a blue light. I have tone controls set to off and the Flex set to renderer only in Roon device setup. Would love to hear from other Flex owners if it works for them.
It seems to be a problem on the Pulse mini and soundbar as well according to this thread: MQA and Bluesound