At this time, it appears as though the advertised feature to sync between a Slack group membership list a groups.io membership list is not implemented or supported.? If this is wrong, please reply.
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For the UNB Amateur Radio Club, I have groups named unbamateurradioclub in both systems.? I expect that these lists will evolve differently and have different uses as groups.io posts are archived indefinitely and for unpaid Slack groups only the most recent ten thousand messages maybe searched.
Brent Petersen