???? The results need to be sent to an organization that our group is a member of.
I assume that the organization is not connected with your group vie Groups.io, for example as a subgroup. Your original question had to do with sending the results to the group, not an external organization. I don¡¯t think there is any way to send it external with a reliable record of provenance.
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For the members, I think replying to the poll (you can do that after you close the poll but before you lock the topic), and including a link to the poll as well as text declaring the results is the best way to do it. Members can either accept your declaration, or log in (if necessary) and see for themselves.