hi,
i am not sure what's different in your setup, because i am using the latest notmuch and a pretty much identical config (i put leafnode as my primary method, but that's all), and it works out of the box, including referring to threads. maybe it's the emacs version? mine says: GNU Emacs 29.0.50 of 2021-11-17 so, it's from emacs master updated a couple of days ago... cheers, jao -- I always pass on good advice. It's the only thing to do with it. It is never any use to oneself. -Oscar Wilde
