I was recording a demo for linking parent groups when I noticed that my request to join a parent group was not sent. The demo group is the Coromandel Coast bioregion and I was joining it to the Bioregion Commons (this being the parent group).
When I clicked add to parent, I clicked on the Bioregional Commons. It prompted me to share why I want to link to this group and I entered my response. It seemed to register.
Then when I went to the Bioregional Commons (I'm an admin) I didn't see a request to join in Related Groups (though it should have just joined them because I'm an admin). I also didn't see a notification of the join request.
I tried this twice and with another dummy group and both times it didn't work.