No, I didn’t do any lambda configuration. I see where you got that impression from the page but that information is for people who want to host the skill themselves. It does seem like there should be some better user documentation.
I just set up my myopenhab.org account, tagged the related items and then did a smart home device discovery from the Alexa application after installing the Alexa openHAB skill (and connecting it to myopenhab.org). It’s been working very well.
