Another yahoo group I'm on is having similar issues I think. One person has complained about it.
On Apr 6, 2018 8:36 AM, "josh.nursing@gmail.com [PolySix]" <PolySix@yahoogroups.com> wrote:
Please check this from the Yahoo Groups Web interface:
a) Try to add a message to a conversation by hitting "Reply"
versus
b) Adding a message to a conversation by using the "Add to conversation" input.
I believe the irst one isn't working at all.
Yash