Error integrating Copilot Studio with PowerAutomate

Hello, 

I am not able to get a response from PowerAtomate triggered from run action in Copilot Studio to the topic that trigged the PA, I get either the system error or: Error Message: The output parameter with name ‘payload’ on flow ‘Run a flow from Copilot’(‘6f348821-0f39-ef11-8409-000d3a8c7216’) is missing from the response data. Please refresh the flow, or ensure the flow returns this value. Error

The return variable is hardcoded in the flow, as POC.

PA works fine if there is no return value.

Thanks;