Tangentially related to this open issue I've been trying to troubleshoot why email notifications do not always go out to my blog subscribers and WordPress/JetPack support mentioned that my blog wasn't currently connected to JetPack, even though it was showing it was in the admin panel.
Suspecting W-HTTPS plugin might be the cause, I disabled JetPack and tried to reconnect. Unsuccessful.
I think disabled W-HTTPS and was able to successfully connect to JetPack.
So... appears to be a conflict between the two.