Group Reporting through Admin Center - No Activity Date?


Hi, everyone!  I'm looking at our Yammer Group Activity report through the Admin Center.  Most of our groups have a "Last Activity Date" listed, but a good number of them have no date at all.  Any idea why?  Can I assume that those groups with no activity date have had no activity since the least recent activity date (4/4/2017, in this case)?  Thanks!

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