I have worked around with RASA + FB messenger. I'm able to interact with bots on messenger as normal. But when it comes to response as Button (postback). It's not working as I tried to click on response button from bots. If I type it do work. I check on logs, and local webhook but it got no interaction. Anyone experience such a case ?
Did you subscribed to postback webhook event in your Developers account? If not, you have to subscribe for that to receive the postback events. See the reference: messaging_postbacks Webhook Event Reference