Did you manage to sort this out?
I have the same problem.
Created the bot, added the API key and sent the registration code.
My user is now registered in the bot, i see my user in the list and i can use it in flows.
But when i sent a Ping i dont get the Pong, also i dont get any message that the bot is sending from a flow.
In the logfile i see that the bot is receiving my Ping messages, and that it sents the Flow results, but i just dont receive them.
