Hello @NicholasF606 ,
thank you for the report, we've tracked the issue to your account for our devs to investigate further. If and when they have an update regarding it, they'll notify you directly. At this time there isn't a hard ETA on a fix. In the meantime the best workaround is the one you already performed by making a list from the non-openers, and then copying the email to send to that RSNO list.
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