It’s been some time since I don’t use the porcupine because I was testing things on different devices and I blocked my account couple of times, seems they have removed the device number limitation from the free tier, which is great.
Probably the library is outdated and don’t work with the current version models, already happened once 
. Would you be able to update the version in the 3.4.x branch of the addons repo and give it a try? Hope it can work just with that.