I saw you commented on the other chain of comments too so you're probably aware that the program at this time doesn't work anymore.
Twitch depreciating the PubSub ended up being at a very inopportune time for me health-wise. That feature is part of how Item Flood confirms you're using an authorized user (if the PubSub confirmed your info was correct and connected then the app would consider itself ready).
I have the updated fix in-progress though but no timeline for release. Thank you again for using and appreciating Item Flood!