Thank you for taking the time to respond, but that article does not answer my question.
When posts of mine are linked to on another blog, I no longer get the notification (and pingback comment) of the mention unless the blog is hosted on free wordpress. I know these blogs have their “Attempt to notify any blogs linked to from the article” enabled because prior to moving self-hosted (I moved from a paid wordpress plan) I used to receive them.
Additionally, it doesn’t appear that the pingbacks I create for other blogs work either, despite having my jetpack settings set appropriately. I’d assume this is a Jetpack issue but I was repeatedly shut down in that regard.
My blogging niche is heavily interactive and collaborative, and we rely heavily on pingbacks. I’d really like to find a solution rather than just accept it, because there is no logical reason for this not to function.
