Keep Alexa Cookie in Node Red

I’m using Alexa in Node Red to send voice to an echo device when certain events happen (i.e., the Roomba gets stuck). My problem is that every couple of days I have to reset the cookie by going to the Amazon site and entering credentials. I’ve read a bunch of tutorials and posts on this, and it sounds like having a local cookie file should alleviate this, but I have one (if I did it right) and it doesn’t help. Does anyone know how to fix this? (I know it’s a Node Red question, but it’s through the HA Alexa nodes)