On Tuesday, October 29, 2019 at 10:47:42 PM UTC-4, Bret Hess wrote:
I'm an owner of a different Yahoo group and find I can't make any group settings changes at all. All appears to be locked down, so I'm not sure a new moderator could be appointed. But I guess with an owner's or moderator's email and password you can do the transfer.

You can use http://www.personalgroupware.com/downloads.htm to download all the content and messages for your group at least as an archive/

Agree. Our group owner changed me to owner from moderator so that I could transfer the group to groups.io automatically. Within the group (gliding club), I now show as owner, but in Yahoo Groups home, I show only as Moderator, so I can't do the change (involves sending an invite). There is no obvious way to do this automatically now.

Dan