Where does the SD Notary app look for Developer IDs?

I am trying the SD Notary 2 app for the first time. It looks great. However, it doesn’t seem to find my developer ID, which blocks the app from doing the good stuff that it does. Any hints?

[UPDATE: Since posting, I’ve discovered that the Late Night software forum (https://forum.latenightsw.com) is probably a better place for this question]