This happened to a Yahoo group that I was a member of about two years ago.? The original group disappeared one day, so the owners created another group with the same name but the number 2 after it.? Many of the members found it when trying to search for the old group and migrated there.? The people who knew email addresses of other members sent out messages to those members as well to tell them of the change.? It wasn't a perfect fix, and many of the original members were lost but at least the group lived on in a new form.? The owners of the old group contacted Yahoo at the time and never got any answers.? The old group was never restored so all of the old, important messages were lost.? About a year ago the group was moved over to Groups.io due to all of the challenges with Yahoo and we have never regretted it.
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Yvette in Ontario